*{
    margin: 0;
    padding: 0;
    font-size: 0;
    overflow: hidden;
}
html,body{
    position: fixed;
    width: 100%;
    height: 100%;
}
button{
    position: relative;
    width: 90%;
    height: 90%;
    top: 5%;
    left: 5%;
}
p{
    position: relative;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}
label{
    overflow: hidden;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
}
img{
    display: block;
    position: relative;
    width: 100%;
    height: 100%;
}
label,p,li,h1{
    /* 選択無効 */
    -webkit-user-select: none; /* Safari Chrome */
    -moz-user-select: none;    /* Firefox */
    -ms-user-select: none;     /* Internet Explorer Edge */
    user-select: none;         /* 標準 */
}
span{
    white-space: nowrap;
    word-break: keep-all;
}