style.scss

@import url(https://fonts.googleapis.com/css?family=Montserrat);

*{
    padding: 0;
    margin: 0;
}

body, html{
    width: 100%;
    height: 100vh;
    background: linear-gradient(to right, #4bb4d2, #359051);
}   

#centering{
    position: relative;
    top: 45vh; left: 30vw;
    min-height: 10vh; min-width: 40vw;

    text-transform: uppercase;
    padding: .4vh;
    font-weight: 1;
    font-family: "Montserrat", Helvetica;
    min-height: 10vh; min-width: 40vw;
    border-radius: 2vh;
    font-size: 6vw;
    background-color: #00000020;
    border: none;
    color: #fff;
    outline: none;
    box-shadow: 2vh 2vh #00000057;
}

#centering:hover{
    animation: wiggle .8s;
    cursor: pointer;
}

@keyframes wiggle{
    0%{transform: rotate(2deg);}
    20%{transform: rotate(-2deg);}
    40%{transform: rotate(2deg);}
    60%{transform: rotate(-2deg);}
    80%{transform: rotate(2deg);}
    100%{transform: rotate(0deg);}
}