/*アニメーションの@keyframes用のCSSコードを書く（ここに書くとAMP用で約500KBまで記入できます）*/
.body {
    position: relative;
}

.raku-changing {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.raku-changing {
    animation-name: change;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
}

@keyframes change {
    0%   { background-position: 100% 0; }
    25%  { background-position: 100% 100%; }
    50%  { background-position: 0 100%; }
    75%  { background-position: 100% 100%; }
    100%  { background-position: 100% 0; }
}