@keyframes animation-sample{
    0%{
        width: 20%;
    }
    50%{
        width: 19%
    }
    100%{
        width: 20%;
    }
}
.animation-box{
    animation-name: animation-sample;
    animation-duration: 4s;
    animation-iteration-count: infinite;
}

@keyframes spin {
	100% {transform: rotate(0deg);}
	100% {transform: rotate(-360deg);}
}

.spin {
	animation: spin 15s linear infinite;
}