*{
    box-sizing: border-box;
}
body{
    width: 100;
    height: 100vh;
    margin: 0;
    padding: 0;
    position: relative;

}
.light{
    background-color: #fff;
}
.dark{
    background-color: #222;
}
#btn{
    width: 155px;
    height: 12vh;
    border-radius: 20px;
    cursor: pointer;
    background-color: blue;
    color: #fff;
    font-size: 20px;
    border: 1px solid blue;
    position: absolute;
    left: 550px;
    top: 250px;
    transition: .3s;
}
#btn:hover{
    transform: scale(.9);
    background-color: rgb(1, 1, 206);
}