雨の朝 @keyframes rbwa{ 0%,50%{background-position-x:0%;} 100%{background-position-x:100%;} } .rbw{ height:2px; background:repeating-linear-gradient(120deg,red,yellow,blue,red 10%) 0 0/1000% 100%; animation:rbwa 15s ease infinite; } 雨の日…