style.css

@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap');

*{
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}

.canvas{
    width: 500px;
    height: 500px;
    background-color: black;
    /* border: 1px solid red; */
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50% , -50%);
    display: none;
}

.start , .result{
    width: 500px;
    height: 500px;
    background-color: black;
    color: white;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);

    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;

    transition: 0.5s;
}

.start h2,
.result h2{
    font-family: "Press Start 2P";
    font-size: 40px;
    margin-bottom: 100px;
}

.start button,
.result button{
    font-size: 30px;
    background-color: aqua;
    padding: 10px 20px;
    border-radius: 30px;
    border: none;
    outline: none;
    cursor: pointer;
}

.winning h2 {
    font-size: 30px;
}