.skeleton{background:linear-gradient(135deg,rgba(130,130,130,.2) 8%,rgba(130,130,130,.3) 18%,rgba(130,130,130,.2) 33%);background-size:400% 400%;animation:wave-diagonal 10s ease-out infinite}@keyframes wave-diagonal{0%{background-position:-400% -400%}to{background-position:400% 400%}}