style.css

body{
    margin:0;
    padding: 0;
    box-sizing: border-box;
    background-color: #001839;
    height: 100vh;
    color: antiquewhite;
    font-family: sans-serif;
}
.score{
    display: flex;
    justify-content: space-around;
    transition: opacity 0.5s ease 0.5s;
}

.score p{
    text-align: center;
    font-size: 20px;
}

.result{
    font-size: 100px;
}

.intro{
    height: 50vh;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    align-items: center;
    transition: opacity 0.5s ease;
}

.intro h1{
    font-size: 50px;
}

.intro button, .match button{
    padding: 10px 15px;
    background-color: #006940;
    border: none;
    font-size: 20px;
    color:antiquewhite ;
    border-radius: 4px;
    outline: none;
    cursor: pointer;
}

.intro button:hover{
    padding: 11px 16px;
}

.match button:hover{
    padding: 11px 16px;
}



.match{
    width: 60vw;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    text-align: center;
    transition: opacity 0.5s ease 0.5s;
}

.winner{
    font-size: 50px;
}

.hands,.options{
    display: flex;
    align-items: center;
    justify-content: space-around;
}

.playerhand{
    transform: rotateY(180deg);
}

div.fadeout{
    opacity: 0;
    pointer-events: none;
}

div.fadein{
    opacity: 1;
    pointer-events: all;
}

@keyframes shakeplayer{
    0%{transform: rotateY(180deg) rotateZ(20deg);}
    15%{transform: rotateY(180deg) rotateZ(0deg);}
    25%{transform: rotateY(180deg) rotateZ(20deg);}
    35%{transform: rotateY(180deg) rotateZ(0deg);}
    50%{transform: rotateY(180deg) rotateZ(20deg);}
    65%{transform: rotateY(180deg) rotateZ(0deg);}
    75%{transform: rotateY(180deg) rotateZ(20deg);}
    85%{transform: rotateY(180deg) rotateZ(0deg);}
    100%{transform: rotateY(180deg) rotateZ(20deg);}
}

@keyframes shakecomputer{
    0%{transform: rotateZ(20deg);}
    15%{transform: rotateZ(0deg);}
    25%{transform: rotateZ(20deg);}
    35%{transform: rotateZ(0deg);}
    50%{transform: rotateZ(20deg);}
    65%{transform: rotateZ(0deg);}
    75%{transform: rotateZ(20deg);}
    85%{transform: rotateZ(0deg);}
    100%{transform: rotateZ(20deg);}
}