@keyframes spinner-border {to {transform: rotate(360deg); } } .spinner-border {display: inline-block;width: 2rem;height: 2rem;vertical-align: text-bottom;border: 0.25em solid currentColor;border-right-color: transparent;border-radius: 50%;animation: spinner-border .75s linear infinite; } .spinner-border-sm {width: 1rem;height: 1rem;border-width: 0.2em; } @keyframes spinner-grow {0% {transform: scale(0); }50% {opacity: 1; } } .spinner-grow {display: inline-block;width: 2rem;height: 2rem;vertical-align: text-bottom;background-color: currentColor;border-radius: 50%;opacity: 0;animation: spinner-grow .75s linear infinite; } .spinner-grow-sm {width: 1rem;height: 1rem; }