Make sure that a fixed div has a width of 100% relative to the parent container

Question

Make sure that a fixed div has a width of 100% relative to the parent container

I'm working on a layout where I have a container with padding and a floating relative div that takes up 40% of the width.

Within this floating div, I have a fixed div that I want to be the same size as its parent. I know that a fixed div is taken out of the normal document flow and doesn't adhere to the padding of the container.

HTML

<div id="wrapper">
  <div id="wrap">
    Some content inside the relative div
    <div id="fixed"></div>
  </div>
</div>

CSS

body { 
  height: 20000px 
}  
#wrapper {
  padding: 10%;
}  
#wrap { 
  float: left;
  position: relative;
  width: 40%; 
  background: #ccc; 
} 
#fixed { 
  position: fixed;
  width: inherit;
  padding: 0px;
  height: 10px;
  background-color: #333;
}

Check out the example in this fiddle: http://jsfiddle.net/C93mk/489/

Can anyone suggest a solution for achieving this layout?

I've updated the fiddle to provide more clarity on what I'm trying to achieve. Sorry for any confusion: http://jsfiddle.net/EVYRE/4/

html css

Answer 1

Answer №1

To achieve the desired result, consider using margin for the .wrap container rather than padding for the .wrapper:

body{ height:20000px }
#wrapper { padding: 0%; }
#wrap{ 
    float: left;
    position: relative;
    margin: 10%;
    width: 40%; 
    background:#ccc; 
}
#fixed{ 
    position:fixed;
    width:inherit;
    padding:0px; 
    height:10px;
    background-color:#333;    
}

Link to jsfiddle

Answer 2

To achieve the desired result, consider using margin for the .wrap container rather than padding for the .wrapper:

body{ height:20000px }
#wrapper { padding: 0%; }
#wrap{ 
    float: left;
    position: relative;
    margin: 10%;
    width: 40%; 
    background:#ccc; 
}
#fixed{ 
    position:fixed;
    width:inherit;
    padding:0px; 
    height:10px;
    background-color:#333;    
}

Link to jsfiddle

Answer 3

Answer №2

One suggestion is to apply a transform to the parent element, even if it's just a zero translation. Also, ensure that the fixed child's width is set to 100%.

body{ height:20000px }
#wrapper {padding:10%;}
#wrap{ 
    float: left;
    position: relative;
    width: 40%; 
    background:#ccc; 
    transform: translate(0, 0);
}
#fixed{ 
    position:fixed;
    width:100%;
    padding:0px;
    height:10px;
    background-color:#333;
}

<div id="wrapper">
    <div id="wrap">
    Some relative item placed item
    <div id="fixed"></div>
    </div>
</div>

Answer 4

One suggestion is to apply a transform to the parent element, even if it's just a zero translation. Also, ensure that the fixed child's width is set to 100%.

body{ height:20000px }
#wrapper {padding:10%;}
#wrap{ 
    float: left;
    position: relative;
    width: 40%; 
    background:#ccc; 
    transform: translate(0, 0);
}
#fixed{ 
    position:fixed;
    width:100%;
    padding:0px;
    height:10px;
    background-color:#333;
}

<div id="wrapper">
    <div id="wrap">
    Some relative item placed item
    <div id="fixed"></div>
    </div>
</div>

Answer 5

Answer №3

Have you checked out this?

$( document ).ready(function() {
    $('#fixed').width($('#wrap').width());
});

Using jQuery, you have the flexibility to set various widths :)

UPDATE: It has been pointed out by dream in the comments that using JQuery solely for this effect is unnecessary and may even be counterproductive. I created this example for individuals who already utilize JQuery for other purposes on their websites and are considering applying it for this specific feature as well. I apologize for any inconvenience my response may have caused.

Answer 6

Have you checked out this?

$( document ).ready(function() {
    $('#fixed').width($('#wrap').width());
});

Using jQuery, you have the flexibility to set various widths :)

UPDATE: It has been pointed out by dream in the comments that using JQuery solely for this effect is unnecessary and may even be counterproductive. I created this example for individuals who already utilize JQuery for other purposes on their websites and are considering applying it for this specific feature as well. I apologize for any inconvenience my response may have caused.

Answer 7

Answer №4

Your container occupies 40% of the width of the parent element.

However, when you apply position:fixed, the width is based on the viewport (document) width...

Upon further consideration, I noticed that your parent element has 10% padding on both left and right sides, meaning your element actually takes up 80% of the total page width. Therefore, your fixed element should be set to 40% based on this 80% of the total width.

To achieve this, simply update your #fixed class to:

#fixed{ 
    position:fixed;
    width: calc(80% * 0.4);
    height:10px;
    background-color:#333;
}

If you are using sass, postcss, or another CSS compiler, consider utilizing variables to prevent layout issues when adjusting the padding value of the parent element.

For an updated demo, check out the following link: http://jsfiddle.net/C93mk/2343/

I hope this information proves useful. Best regards!

Answer 8

Your container occupies 40% of the width of the parent element.

However, when you apply position:fixed, the width is based on the viewport (document) width...

Upon further consideration, I noticed that your parent element has 10% padding on both left and right sides, meaning your element actually takes up 80% of the total page width. Therefore, your fixed element should be set to 40% based on this 80% of the total width.

To achieve this, simply update your #fixed class to:

#fixed{ 
    position:fixed;
    width: calc(80% * 0.4);
    height:10px;
    background-color:#333;
}

If you are using sass, postcss, or another CSS compiler, consider utilizing variables to prevent layout issues when adjusting the padding value of the parent element.

For an updated demo, check out the following link: http://jsfiddle.net/C93mk/2343/

I hope this information proves useful. Best regards!

Answer 9

Answer №5

To ensure that the footer remains at the bottom of the parent div, you can utilize absolute positioning. In this scenario, I have included 10px padding-bottom to the wrap element to match the height of the footer. By using absolute positioning relative to the parent div instead of removing it from the flow entirely, the layout remains stable.

body{ height:20000px }
#wrapper {padding:10%;}
#wrap{ 
    float: left;
    padding-bottom: 10px;
    position: relative;
    width: 40%; 
    background:#ccc; 
}
#fixed{ 
    position:absolute;
    width:100%;
    left: 0;
    bottom: 0;
    padding:0px;
    height:10px;
    background-color:#333;

}

http://jsfiddle.net/C93mk/497/

Answer 10

To ensure that the footer remains at the bottom of the parent div, you can utilize absolute positioning. In this scenario, I have included 10px padding-bottom to the wrap element to match the height of the footer. By using absolute positioning relative to the parent div instead of removing it from the flow entirely, the layout remains stable.

body{ height:20000px }
#wrapper {padding:10%;}
#wrap{ 
    float: left;
    padding-bottom: 10px;
    position: relative;
    width: 40%; 
    background:#ccc; 
}
#fixed{ 
    position:absolute;
    width:100%;
    left: 0;
    bottom: 0;
    padding:0px;
    height:10px;
    background-color:#333;

}

http://jsfiddle.net/C93mk/497/

Answer 11

Answer №6

Looking at your most recent jsfiddle, it appears that you overlooked a crucial detail:

#sidebar_wrap {
  width:40%;
  height:200px;
  background:green;
  float:right;
}
#sidebar {
  width:inherit;
  margin-top:10px;
  background-color:limegreen;
  position:fixed;
  max-width: 240px; /*Don't forget this*/
}

But why does this matter? Let's break it down to understand why things may appear larger than expected.

A fixed element like #sidebar bases its size off the window's width, as is standard for fixed elements. With width:inherit set in this element and a 40% width on #sidebar_wrap, the calculation becomes window.width * 40%. So, if your window width exceeds the width of .container, then #sidebar will be larger than #sidebar_wrap.

To prevent this issue, it's essential to define a max-width for your #sidebar_wrap to ensure it doesn't exceed its intended size.

Take a look at this updated jsfiddle showcasing the corrected code and providing further clarification on how this concept operates.

Answer 12

Looking at your most recent jsfiddle, it appears that you overlooked a crucial detail:

#sidebar_wrap {
  width:40%;
  height:200px;
  background:green;
  float:right;
}
#sidebar {
  width:inherit;
  margin-top:10px;
  background-color:limegreen;
  position:fixed;
  max-width: 240px; /*Don't forget this*/
}

But why does this matter? Let's break it down to understand why things may appear larger than expected.

A fixed element like #sidebar bases its size off the window's width, as is standard for fixed elements. With width:inherit set in this element and a 40% width on #sidebar_wrap, the calculation becomes window.width * 40%. So, if your window width exceeds the width of .container, then #sidebar will be larger than #sidebar_wrap.

To prevent this issue, it's essential to define a max-width for your #sidebar_wrap to ensure it doesn't exceed its intended size.

Take a look at this updated jsfiddle showcasing the corrected code and providing further clarification on how this concept operates.

Answer 13

Answer №7

It is recommended to remove Padding: 10%; or consider using px instead of percent for the .wrap element

To see an example, visit: http://jsfiddle.net/C93mk/493/

HTML :

<div id="wrapper">
    <div id="wrap">
    Some relative item placed here
    <div id="fixed"></div>
    </div>
</div>

CSS:

body{ height:20000px }
#wrapper {padding:10%;}
#wrap{ 
    float: left;
    position: relative;
    width: 200px; 
    background:#ccc; 
}
#fixed{ 
    position:fixed;
    width:inherit;
    padding:0px;
    height:10px;
    background-color:#333;

}

Answer 14

It is recommended to remove Padding: 10%; or consider using px instead of percent for the .wrap element

To see an example, visit: http://jsfiddle.net/C93mk/493/

HTML :

<div id="wrapper">
    <div id="wrap">
    Some relative item placed here
    <div id="fixed"></div>
    </div>
</div>

CSS:

body{ height:20000px }
#wrapper {padding:10%;}
#wrap{ 
    float: left;
    position: relative;
    width: 200px; 
    background:#ccc; 
}
#fixed{ 
    position:fixed;
    width:inherit;
    padding:0px;
    height:10px;
    background-color:#333;

}

Make sure that a fixed div has a width of 100% relative to the parent container

HTML

CSS

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

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