CSS radial / circular progress indicator with a transparent middle - css

Question

I'd like to make a radial progress indicator with css that has it's middle circle transparent. See here: http://codepen.io/geedmo/pen/InFfd – it's a perfect example of what I want to do but the middle (.overlay) has background-color which overlays the bigger circle. However, I'd like to have it transparent (the bigger circle would have transparent middle too). How to do it?
<div class="wrap">
<div class="progress-radial progress-25">
<div class="overlay">25%</div>
</div>
<div class="progress-radial progress-50">
<div class="overlay">50%</div>
</div>
<div class="progress-radial progress-75">
<div class="overlay">75%</div>
</div>
<div class="progress-radial progress-90">
<div class="overlay">90%</div>
</div>
</div>
SASS:
// Colors
$barColor: tomato
$overlayColor: #fffde8
$backColor: #2f3439
#import url(http://fonts.googleapis.com/css?family=Noto+Sans)
body
padding: 30px 0
background-color: $backColor
font-family: 'Noto Sans', sans-serif
.wrap
width: 600px
margin: 0 auto
/* -------------------------------------
* Bar container
* ------------------------------------- */
.progress-radial
float: left
margin-right: 30px
position: relative
width: 100px
height: 100px
border-radius: 50%
border: 2px solid $backColor // remove gradient color
/* -------------------------------------
* Optional centered circle w/text
* ------------------------------------- */
.progress-radial .overlay
position: absolute
width: 60px
height: 60px
background-color: $overlayColor
border-radius: 50%
margin-left: 20px
margin-top: 20px
text-align: center
line-height: 60px
font-size: 16px
/* -------------------------------------
* Mixin for progress-% class
* ------------------------------------- */
$step: 5 // step of % for created classes
$loops: round(100 / $step)
$increment: 360 / $loops
$half: round($loops / 2)
#for $i from 0 through $loops
.progress-#{$i*$step}
#if $i < $half
$nextdeg: 90deg + ( $increment * $i )
border-image: linear-gradient(90deg, $backColor 50%, transparent 50%, transparent), linear-gradient($nextdeg, $barColor 50%, $backColor 50%, $backColor)
#else
$nextdeg: -90deg + ( $increment * ( $i - $half ) )
border-image: linear-gradient($nextdeg, $barColor 50%, transparent 50%, transparent), linear-gradient(270deg, $barColor 50%, $backColor 50%, $backColor)
This is the result I'd like to get:

Answer 1

html code :
<div class="wrapper">
<div class="pie spinner lightBlue"></div>
<div class="pie filler lightBlue"></div>
<div class="mask"></div>
</div>
css code :
body {
background-color: #f3f3f4;
}
.lightBlue {
border: 10px solid #a8d2d2;
}
.wrapper {
width: 250px;
height: 250px;
margin: 10px auto;
position: relative;
background: white;
background-color: #f3f3f4;
-webkit-transition: width 0.5s, height 0.5s;
transition: width 0.5s, height 0.5s;
-webkit-animation: finalRota 2s 10s linear forwards;
animation: finalRota 2s 10s linear forwards;
}
.wrapper .pie {
width: 50%;
height: 100%;
position: absolute;
background-color: radial-gradient(left center, circle, #00ccff 0px, #000088 100%);
-webkit-transform-origin: 100% 50%;
-ms-transform-origin: 100% 50%;
transform-origin: 100% 50%;
}
.wrapper .spinner {
border-radius: 100% 0 0 100% / 50% 0 0 50%;
z-index: 200;
background-color: radial-gradient(right center, circle, #00ccff 0px, #000088 100%);
border-right: none;
-webkit-animation: rota 10s linear forwards;
animation: rota 10s linear forwards;
}
.wrapper .filler {
border-radius: 0 100% 100% 0 / 0 50% 50% 0;
left: 50%;
border: 10px solid #8dbdbb;
opacity: 0;
z-index: 100;
border-left: none;
-webkit-animation: fill 10s steps(1, end) forwards;
animation: fill 10s steps(1, end) forwards;
}
.wrapper .mask {
width: 50%;
height: 100%;
position: absolute;
background: inherit;
opacity: 1;
z-index: 300;
-webkit-animation: mask 10s steps(1, end) forwards;
animation: mask 10s steps(1, end) forwards;
}
#-webkit-keyframes opoFinalRota {
100% {
-webkit-transform: rotate(30deg);
-ms-transform: rotate(30deg);
transform: rotate(30deg);
}
}
#keyframes opoFinalRota {
100% {
-webkit-transform: rotate(30deg);
-ms-transform: rotate(30deg);
transform: rotate(30deg);
}
}
#-webkit-keyframes rota {
0% {
-webkit-transform: rotate(300deg);
transform: rotate(300deg);
}
100% {
-webkit-transform: rotate(60deg);
transform: rotate(60deg);
}
}
#keyframes rota {
0% {
-webkit-transform: rotate(300deg);
transform: rotate(300deg);
}
100% {
-webkit-transform: rotate(60deg);
transform: rotate(60deg);
}
}
#-webkit-keyframes mask {
0% {
opacity: 1;
}
50%, 100% {
opacity: 0;
}
}
#keyframes mask {
0% {
opacity: 1;
}
50%, 100% {
opacity: 0;
}
}
#-webkit-keyframes fill {
0% {
opacity: 0;
}
50%, 100% {
opacity: 1;
}
}
#keyframes fill {
0% {
opacity: 0;
}
50%, 100% {
opacity: 1;
}
}
and a demo : http://jsfiddle.net/usrs01ye/2/

Answer 2

Just set your $overlayColor variable to transparent
$overlayColor: transparent
Here's a working codepen