CSS note

Pure CSS Circle Timer

HTML

CSS

.timer {
 background: -webkit-linear-gradient(left, skyBlue 50%, #eee 50%);
 /* Foreground color, Background colour */ border-radius: 100%;
 height: 100px;
 /* Height and width */ position: relative;
 width: 100px;
 /* Height and width */ -webkit-animation: time 20s steps(20, start) infinite;
 /* Animation time and number of steps */ }
.mask {
 border-radius: 100% 0 0 100% / 50% 0 0 50%;
 height: 100%;
 left: 0;
 position: absolute;
 top: 0;
 width: 50%;
 -webkit-animation: mask 20s steps(10, start) infinite;
 /* Animation time and number of steps (halved) */ -webkit-transform-origin: 100% 50%;
}
@-webkit-keyframes time {
 100% {
 -webkit-transform: rotate(360deg);
}
}
@-webkit-keyframes mask {
 0% {
 background: #eee;
 /* Background colour */ -webkit-transform: rotate(0deg);
}
50% {
 background: #eee;
 /* Background colour */ -webkit-transform: rotate(-180deg);
}
50.01% {
 background: skyBlue;
 /* Foreground colour */ -webkit-transform: rotate(0deg);
}
100% {
 background: skyBlue;
 /* Foreground colour */ -webkit-transform: rotate(-180deg);
}
}

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