.setting-button{
    position: fixed;
    bottom: 20px;
    left: 20px;
    
    width: 100px;
    height: 50px;
    font-size: 40px;
    text-align: center;
    margin: auto;
    display: flex;
    align-content: center;
    justify-content: center;
    align-items: center;
    z-index: 9999;

}
.setting-button button{
    width: 100%;
    height: 100%;
    background-color: blue;
    border: solid 0px;
    border-radius: 5px;

}
.setting-button i{
    font-size: 35px;
    color: #fff;
}
.setting-button i:nth-child(2){
    opacity: 0;
    display: none;
    transition: 0.3s;
}
/*
.setting-button button:hover i:nth-child(2){
    opacity: 1;
    display: block;
}

.setting-button:hover i:nth-child(1){
    opacity: 0;
    display: none;
}
*/