@charset "utf-8";
#content{
    position: relative;
}
 
#topBtn {
    /*-----必須-----*/
    position: fixed;
    bottom: 10px;
    right: 10px;
     
    /*-----装飾-----*/
    width: 64px;
    height: 64px;
    line-height: 64px;
    text-align: center;
    background-color: #666;
    border-radius: 50px;
    color: #fff;
    text-decoration: none;
}

@media screen and (min-width:680px) {
    #topBtn {
        bottom: 30px;
        right: 30px;
        border-radius: 10px;
    }
}