two adjacent DIV elements with matching heights

Currently, I am in the process of developing an internal web page with a wrapper DIV structure based on recommendations from an online tutorial. Within this wrapper, there are different sections including a header, mainnav, content, sidenav, and footer. The content and sidenav are positioned as side by side DIVs, with the sidebar featuring a menu that is subject to change. My current challenge lies in trying to ensure that the content DIV matches the height of the sidenav.

Below is the CSS for these two DIVs:

#content {
    width: 75%;
    float: left;
    padding-top: 5px;
    height: 100%;
}
#sidenav {
    width: 25%;
    float: right;
}

In addition, here is the CSS code for the overall wrapper:

#wrapper {
    background-color: #FFFFFF;
    width: 100%;
    min-width: 740px;
    max-width: 1000px;
    margin-right: auto;
    margin-left: auto;
    -webkit-box-shadow: 0px 1px 20px #999999;
    box-shadow: 0px 1px 20px #999999;
}
htmlcss

Answer №1

Assign the following attribute to both elements:

height:100%;

If you specify a height for the wrapper div, they will occupy the entire height. It is recommended to include an additional div after them and apply the styling below to prevent overflow:

width: 100%;
clear: both;

Answer №2

When using a height of 100%, it may not work if there is no parent element with a defined height. If you need elements to have the same height, consider adding a background color to the wrapper and adjusting styles as needed. For tackling challenges like this in the future, exploring frameworks like Bootstrap can be helpful.

Check out this example on JSFiddle

.column {
    float: left;
    width: 33%;
}
.menu {
    background:red;
}
.content {
    background:blue;
}
.clear {
    clear: both;
    width: 100%;
}

The provided Fiddle demonstrates the use of clear, but note that the columns do not necessarily have the same height.

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