#button{display: inline-block;
    background-color: #1c94c4;
    width: 50px;
    height: 50px;
    line-height: 60px;
    text-align: center;
    border-radius: 4px;
    position: fixed;
    bottom: 30px;
    right: 30px;
    transition: background-color .3s;
    opacity: 0;
    z-index: 1000;
}

#button i {font-size: 32px;
    color: white; }

#button:hover{
    cursor: pointer;
    background-color: #0c65a5;
}
#button.show{
    opacity: 1;
}