body {
    background-color: black;
    color: white;
    font-family: serif;
}

body, #wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

footer {
    margin-top: auto;
}

/*選択禁止*/

.noselect {
    -webkit-touch-callout: none;
    /* iOS Safari */
    -webkit-user-select: none;
    /* Safari */
    -khtml-user-select: none;
    /* Konqueror HTML */
    -moz-user-select: none;
    /* Firefox */
    -ms-user-select: none;
    /* Internet Explorer/Edge */
    user-select: none;
    /* Non-prefixed version, currently
                                  supported by Chrome and Opera */
}

/*リンク付き画像半透明化*/

a:hover img {
    transition: .3s;
    /*透明化までの時間*/
    opacity: 1;
    /*透明度*/
    filter: alpha(opacity=60);
    /*IE用透明度*/
    -moz-opacity: 0.6;
    /*旧FireFox用*/
}

/*スタートボタン用*/

.start {
    background-color: black;
    max-width: 50%;
    height: auto;
    object-fit: cover;
    opacity: 0.6;
    position: relative;
    /*相対位置*/
    /*装飾*/
    display: inline-block;
    border: 4px solid #fff;
    border-radius: 4px;
    text-align: center;
}

/*画像上のテキスト*/

.ontext {
    position: relative;
    /* 絶対位置指定 */
    font-size: 200%;
    text-align: center;
    color: #fff;
    background: rgba(0, 0, 0, 0.3);
    /* 帯の透明度 */
}

#ac-permission-bt {
    text-align: center;
    margin-top: 20px;
}