Responsive CSS Circles

Question

Goal:

Responsive CSS circles that:

1. Scale with equal radius.
2. Radius can be calculated by percent.
3. Radius can be con

Answer 1

You don't need @media queries for this. This is my try, pure CSS:

.x1 {
    overflow:hidden;
}
.x1 .x2 {
    display:block;
    float:left;
    padding: 12.5%;
    width:auto;
    height:auto;
    border-radius:50%;
    -moz-border-radius:50%;
    -webkit-border-radius:50%;
    -khtml-border-radius: 50%;
    background:#eee;
    text-align:center;
    position: relative;
}
.x1 .x2 span {
    position: absolute;
    width: 100%;
    left: 0;
    top: 48%;
    line-height: 1em;
    height: 1em;
    font-size: 100%;
    overflow: hidden;
}​

Fiddle

Full Screen

Answer 2

I know this solution differs quite a bit from what has been suggested here but I still thought it would be worth putting it up.

I used an image as a mask to create the circle and took advantage of the fact that when padding is specified as a percentage it is calculated based on the width of its parent element rather than the height. This enabled me to create a perfect square.

Demonstration of circles proportionally resizing here

HTML code

<div class="container">
    <img class="circle" src="circleImage.png">
</div>

CSS code

.container {
    position: relative;
    float: left;
    width: 50%;
    height: 0;
    padding-bottom: 50%;
    background-color: #bbb;

}

.circle { 
    position: absolute;
    width: 100%;
    left: 0;
    top: 0;
    height: auto;
    z-index: 1;
}

@media (max-width: 320px) {
    .container { width: 100%; padding-bottom: 100%; }
}

@media (min-width: 321px) and (max-width: 800px) {
    .container { width: 50%; padding-bottom: 50%; }
}

@media (min-width: 801px) {
    .container { width: 25%; padding-bottom: 25%; }
}

Demonstration of the above circles sub-divided into sections as per your question here

Answer 3

Shorter Code

This solution reduces your code size but keeps the functionality in place. I've kept the original .x#, eliminating the .x0, .x3, and .x6 that were not needed. So in a final solution, you would probably renumber (but I wanted you to see what was eliminated).

Any of your pieces "splitting" the circle that require a different top or left setting will need to have a selector that meets or exceeds the .x2 > div selector to override, hence why I have .x2 > .x7 etc. for some of my selectors.

(As noted in the comments below, Chrome has bug issues with the original technique the OP had posted at the time of the bounty starting. This does not solve those, so view the following in another browser.)

Here's the modified fiddle.

HTML

<div class="x1">
        <div class="x2">
                <!-- BEG Content -->
                <div class="x4">
                    dude
                </div>
                <div class="x7">
                    dude
                </div>
                <div class="x8">
                    dude
                </div>
                <div class="x5">
                    dude
                </div>
                <!-- END Content -->
        </div>
        <div class="x2"></div>
        <div class="x2"></div>
        <div class="x2"></div>
    </div>

CSS

.x1 {
    margin:0px auto;
}
.x2 {
    overflow:hidden;
    display:block;
    float:left;
    width:auto;
    height:auto;
    position: relative;
    border-radius:50%;
    -moz-border-radius:50%;
    -webkit-border-radius:50%;
    -khtml-border-radius: 50%;
    background:#eee;
}

/* BEG Content */
.x2 > div {
    position: absolute;
    text-align: center;
    top: 0;
    left: 0;
}
.x4,.x5 {
    width:100%;
    height: 20%;
}
.x2 > .x7, .x2 > .x8 {
    width:50%;
    height: 60%;
    top: 20%;
}
.x4 {
    background-color:blue;
}
.x2 > .x5 {
    background-color:yellow;
    top: 80%;
}

.x7 {
    background-color:green;
}
.x2 > .x8 {
    background-color:orange;
    left: 50%;
}
/* END Content */
@media (max-width: 320px)
{
    .x2 {padding: 50%;}
}

@media (min-width: 321px) and (max-width: 800px)
{
    .x2 {padding: 25%;}
}

@media (min-width: 801px)
{
    .x1 {width:800px}
    .x2 {padding: 12.5%;}
}

EDIT: Based on comments, it appears the OP desired something more like the control this fiddle offers (not functional in Chrome; the OP has not at the time of this edit replied for me to know if that is the type of functionality desired or not).

Answer 4

Solution:

http://jsfiddle.net/WTWrB/

The DIV structure:

We use overflow:hidden in .x2 for spill off background colors in .x3 of child elements.

Notice the content starts inside of .x3

<div class="x0">
    <div class="x1">
        <div class="x2">
            <div class="x3">
                <!-- BEG Content -->
                <div class="x4">
                    dude
                </div>
                <div class="x6">
                    <div class="x7">
                        dude
                    </div>
                    <div class="x8">
                        dude
                    </div>
                </div>                
                <div class="x5">
                    dude
                </div>
                <!-- END Content -->
            </div>
        </div>
        <div class="x2"></div>
        <div class="x2"></div>
        <div class="x2"></div>
    </div>
</div>

The CSS:

@media (max-width: 320px)
{
    .x2 {padding: 50%;}
}

@media (min-width: 321px) and (max-width: 800px)
{
    .x2 {padding: 25%;}
}

@media (min-width: 801px)
{
    .x1 {width:800px}
    .x2 {padding: 12.5%;}
}
.x0 {
    float:left;
    width:100%;
}
.x1 {
    margin:0px auto;
}
.x2 {
    overflow:hidden;
    display:block;
    float:left;
    width:auto;
    height:auto;
    position: relative;
    border-radius:50%;
    -moz-border-radius:50%;
    -webkit-border-radius:50%;
    -khtml-border-radius: 50%;
    background:#eee;
}
.x3 {
    position: absolute;
    width: 100%;
    left: 0;
    top:0;
    font-size: 100%;
    float:left;
    height:100%;
    background-color:red;
}
/* BEG Content */
.x3 div{float:left;}
.x4,.x5,.x6 {
    width:100%;
}
.x7,.x8 {
    width:50%;
    float:left;
    height:100%;
}
.x4,.x5,.x7,.x8 {
    text-align:center;
}
.x4 {
    background-color:blue;
    height:20%;
}
.x5 {
    background-color:yellow;
    height:20%;
}
.x6 {
    height:60%;
}
.x7 {
    background-color:green;
}
.x8 {
    background-color:orange;
}
/* END Content */