body{
    transition: all 1s;
}

.btn{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
}

button{
    position: relative;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    border: none;
    outline: none;
    padding: 1rem 1.5rem;
    font-size: 3rem;
    cursor: pointer;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.331);
    transition: all 0.4s;
    border-radius: 0.5rem;
    margin: 1rem;

}

button:hover{
    box-shadow: 0px 0px 15px rgba(0, 0, 0, 0.438);
}