Issue with vertical alignment within nested divs

I have been attempting to center a search bar inside a top banner vertically. My understanding was that the following code could achieve this:

#banner {
height: 35px;
width: 100%;
}

#searchbar {
    height: 15px;
    position: relative;
    top: 50%;
    margin-top: -7.5px; /* half of the height */
}

However, when I add the margin-top, it affects the #banner as well.

Is there an alternative method to accomplish vertical centering, or am I making a mistake?

You can view my actual code on jsFiddle here.

Answer №1

My approach involves using the CSS property line-height, where the value matches the height of the parent div.

You can see an example of this technique here: http://jsfiddle.net/vkJ78/24/

The CSS code snippet is as follows:

#banner    {
    background-color: #770E17;
    height: 35px;
    width: 100%;
    border-bottom: 1px solid #333;
}

#src    {
    width: 300px;
    height: 15px;
    border: 1px solid #333;
    padding: 3px;
}

#srcdiv {
    width: 308px;
    margin: 0px auto;
    position: relative;
    line-height: 35px;
}

EDIT: Following a suggestion from NGLN, implementing this method not only resolves vertical alignment but also ensures horizontal centering by making #srcdiv and #src widths equal.

Answer №2

To achieve the desired effect, apply overflow: hidden to #banner in order to clear the float.

Next, adjust the negative margin by setting margin-top: -11px in #srcdiv (be sure to factor in the div height, border, and padding for total height).

Visit this link to view an example.

Answer №3

Set margin:0px and padding:0px while eliminating margin-top

body {
    margin:0px;
    padding:0px;

}

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