@charset "utf-8";
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    text-align: center;
    white-space: nowrap;
    color: #000;
}
body {
    font-family:Lucida Grande, Helvetica, Arial, sans-serif;
}
h1 {
    font-size: 4vw;
}
p {
    font-size: 5vw;
}
a {
    color: inherit;
    text-decoration: none;
}
.irasshai {
    font-size: 4vw;
    display: block-inline;
    border: 1px solid #000;
    background: #fff;
    padding: 20px 30px;
    position: relative;
    top: 50px;
}
@keyframes iridescence {
    0% {background: red;}
    17% {background: orange;}
    33% {background: yellow;}
    50% {background: green;}
    67% {background: blue;}
    83% {background: purple;}
    100% {background: red;}

}
.irasshai:hover {
    animation-name: iridescence;
    animation-duration: 0.2s;
    animation-iteration-count: infinite;
}