When applying rounded corners, the child div fails to fully occupy the parent div

To view a demonstration of the issue, click on this link.

Below is the HTML code snippet:

<div id="outer">
    <div id="inner">
    </div>
</div>

And here is the corresponding CSS code:

#inner{
  height: 100%;
  width: 100%;
    border-radius: 20px;
    text-shadow: 5px 5px 5px #000000;
    background-color: white;
    opacity: 0;
    -webkit-transition: opacity .5s linear;
    -moz-transition: opacity .5s linear;
    transition: opacity .5s linear;
}

#inner:hover{
    opacity: 1;
}

#outer{
    border: 6px solid #dcc5c5;
    border-radius: 20px;
    text-shadow: 5px 5px 5px #000000;
    position: relative;
    display: inline-block; 
    transition: all 0.5s ease-in-out;
    background-color: red;
  height: 200px;
  width: 200px;
}

I have attempted various solutions found here and here but none have resolved the issue.

Answer №1

you have specified margin-top:20px; for this element

#inner {
    height: 100px;

    background-color: #42749F;
    width: 200px;

    /* -1px here to compensate for the outer border of the container */
    -moz-border-radius: 0 0 9px 9px;
}

If you remove the margin, it will fill inside the parent element

Check out the working fiddle

Answer №2

An issue arises when the child element's styling takes precedence over the parent, such as when the parent div specifies:

text-font: Sans-Serif

but the child overrides it with:

text-font: Arial

In this case, the child's styling wins out. Essentially, the parent serves as the "Default". The same pattern applies to properties like "rounded corners" and "margin-top", where the latter takes priority.

It is essential to ensure that these details are correctly implemented in the cascading style sheets.

Answer №3

It seems like the issue with the sizing of the child element is caused by the border you have applied to the parent container. By removing the border, the child element can now fully occupy the space within its parent.

Does this solution align with what you were aiming for? Feel free to provide further details or ask questions in the comments section below.

.container {
  position: relative;
  overflow: hidden;
  border-radius: 20px;
  transition: all 0.5s ease-in-out;
  background-color: red;
  height: 200px;
  width: 200px;
}

.child-element{
  height: 100%;
  width: 100%;
  background-color: white;
  opacity: 0;
  transition: opacity .5s linear;
}

.child-element:hover{
  opacity: 1;
}
<div class="container">
  <div class="child-element">Content</div>
</div>

Answer №4

By adjusting the border-width of the outer element (.box_1 / #outer) and the border-radius of the inner element (#scratcher / #inner) by a difference of 6px, you can eliminate the corner gaps.

Simply subtract 6px from the border-radius value of the inner element (#scratcher / #inner).

#inner {
  height: 100%;
  width: 100%;
  border-radius: 13px;
  text-shadow: 5px 5px 5px #000000;
  background-color: white;
  opacity: 0;
  -webkit-transition: opacity .5s linear;
  -moz-transition: opacity .5s linear;
  transition: opacity .5s linear;
}

#inner:hover {
  opacity: 1;
}

#outer {
  border: 6px solid #dcc5c5;
  border-radius: 20px;
  text-shadow: 5px 5px 5px #000000;
  position: relative;
  display: inline-block;
  transition: all 0.5s ease-in-out;
  background-color: red;
  height: 200px;
  width: 200px;
}
<div id="outer">
  <div id="inner">
  </div>
</div>

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