twbs--bootstrap/scss/_spinners.scss

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//
// Rotating border
//
@keyframes spinner-border {
to { transform: rotate(360deg); }
}
.spinner-border {
position: relative;
display: inline-block;
width: $spinner-width;
height: $spinner-height;
overflow: hidden;
text-indent: -999em;
vertical-align: text-bottom;
border: $spinner-border-width solid;
border-color: currentColor transparent currentColor currentColor;
border-radius: 50%;
animation-name: spinner-border;
animation-duration: .75s;
animation-timing-function: linear;
animation-iteration-count: infinite;
}
.spinner-border-sm {
width: $spinner-width-sm;
height: $spinner-height-sm;
border-width: $spinner-border-width-sm;
}
//
// Growing circle
//
@keyframes spinner-grow {
0% {
opacity: 0;
transform: scale(0);
}
50% {
opacity: 1;
}
100% {
opacity: 0;
transform: scale(1);
}
}
.spinner-grow {
position: relative;
display: inline-block;
width: $spinner-width;
height: $spinner-height;
overflow: hidden;
text-indent: -999em;
vertical-align: text-bottom;
background-color: currentColor;
border-radius: 50%;
animation-name: spinner-grow;
animation-duration: .75s;
animation-timing-function: linear;
animation-iteration-count: infinite;
}
.spinner-grow-sm {
width: $spinner-width-sm;
height: $spinner-height-sm;
}