Combining CSS elements into one element

Question

I am trying to create a very specific image using CSS (unless there is a better way to do it which I have yet to discover). I have created the image using Photoshop, but the resolution is not as high as I want it to be. Below is the code and the result. What I want to do, though, is combine all three of the CSS styles into one so that every time I want to show the image, I don't have to draw each of the three circles. Any insight would be great, or a better idea to achieve the same thing.

#box {
  display: block;
  width: 1.5em;
  height: 1.5em;
  background-color: #74afad;
  position: absolute;
  border-radius: 100%;
  z-index: -1;
  margin-top: auto;
  margin-bottom: auto;
  vertical-align: middle;
}
#whiteCircle {
  display: block;
  width: 1.25em;
  height: 1.25em;
  background-color: white;
  position: relative;
  border-radius: 100%;
  z-index: 0;
  margin-top: 50%;
  top: -.625em;
  margin-left: 50%;
  left: -.625em;
  vertical-align: middle;
}
#orangeCircle {
  display: block;
  width: 1em;
  height: 1em;
  background-color: #ff7e00;
  position: absolute;
  border-radius: 100%;
  z-index: 1;
  margin-top: 50%;
  margin-left: 50%;
  top: -.5em;
  left: -.5em;
  vertical-align: middle;
}

<div id="box">
  <div id="whiteCircle">
    <div id="orangeCircle">
    </div>
  </div>
</div>

Thank you!

Answer 1

try using gradients

<style type="text/css">

.circle{
width: 1.5em;
height: 1.5em;
border-radius: 50%;
background: -moz-radial-gradient(center, ellipse cover, #ff7e00 0%, #ff7e00 45%, #ffffff 45%, #ffffff 58%, #74afad 58%, #74afad 100%); /* FF3.6+ */
background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%,#ff7e00), color-stop(45%,#ff7e00), color-stop(45%,#ffffff), color-stop(58%,#ffffff), color-stop(58%,#74afad), color-stop(100%,#74afad)); /* Chrome,Safari4+ */
background: -webkit-radial-gradient(center, ellipse cover, #ff7e00 0%,#ff7e00 45%,#ffffff 45%,#ffffff 58%,#74afad 58%,#74afad 100%); /* Chrome10+,Safari5.1+ */
background: -o-radial-gradient(center, ellipse cover, #ff7e00 0%,#ff7e00 45%,#ffffff 45%,#ffffff 58%,#74afad 58%,#74afad 100%); /* Opera 12+ */
background: -ms-radial-gradient(center, ellipse cover, #ff7e00 0%,#ff7e00 45%,#ffffff 45%,#ffffff 58%,#74afad 58%,#74afad 100%); /* IE10+ */
background: radial-gradient(ellipse at center, #ff7e00 0%,#ff7e00 45%,#ffffff 45%,#ffffff 58%,#74afad 58%,#74afad 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ff7e00', endColorstr='#74afad',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */

}

</style>


<div class="circle"></div>

Answer 2

You can reduce everything to a single CSS class by using pseudo-elements instead of explicit div tags.

Instead of using an id selector, use a class (.box instead of #box) and then you can safely reuse the class throughout your pages.

#box {
  display: block;
  width: 1.5em;
  height: 1.5em;
  background-color: #74afad;
  position: absolute;
  border-radius: 100%;
  z-index: -1;
  margin-top: auto;
  margin-bottom: auto;
  vertical-align: middle;
}
#box:before {
  content: '';
  display: block;
  width: 1.25em;
  height: 1.25em;
  background-color: white;
  position: relative;
  border-radius: 100%;
  z-index: 0;
  margin-top: 50%;
  top: -.625em;
  margin-left: 50%;
  left: -.625em;
  vertical-align: middle;
}
#box:after {
  content: '';
  display: block;
  width: 1em;
  height: 1em;
  background-color: #ff7e00;
  position: absolute;
  border-radius: 100%;
  z-index: 1;
  margin-top: 50%;
  margin-left: 50%;
  top: -.5em;
  left: -.5em;
  vertical-align: middle;
}

<div id="box"></div>