.marching-border-btn{position:relative;z-index:1}.marching-border-btn:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:repeating-linear-gradient(90deg,#cbd5e1,#cbd5e1 5px,transparent 0,transparent 8px) 0 0 /100% 1px no-repeat,repeating-linear-gradient(180deg,#cbd5e1,#cbd5e1 5px,transparent 0,transparent 8px) 100% 0 /1px 100% no-repeat,repeating-linear-gradient(90deg,#cbd5e1,#cbd5e1 5px,transparent 0,transparent 8px) 0 100% /100% 1px no-repeat,repeating-linear-gradient(180deg,#cbd5e1,#cbd5e1 5px,transparent 0,transparent 8px) 0 0 /1px 100% no-repeat;animation:marching-border .6s linear infinite}@keyframes marching-border{0%{background-position:0 0,100% 0,0 100%,0 0}to{background-position:8px 0,100% 8px,-8px 100%,0 -8px}}