style.css

#title {
    display: flex;
    justify-content: center;
    margin: 1em;
    font-size: 30px;
}

#canvasWarpper {
    position: relative;
    display: flex;
    border-radius: 25px;
    border: 2px solid black;
    width: 100%;
    height: 500px;
}

#gameOverWarpper {
    display: none;
}

#gameOverMsg {
    position: absolute;
    top: 4em;
    left: 70%;
    align-content: center;
    display: flex;
    color: black;
    font-size: 50px;
    -webkit-transform: rotate(30deg); /* 글씨 회전 */
    
    
}

#gameAgainBtn {
    display: flex;
    position: absolute;
    top: 10em;
    left: 40%;
    width: 10em;
    height: 2em;
    justify-content: center;
    align-items: center;
    border-radius: 25px;
    border: 2px solid black;
    background-color: #ffc80b;
    color: black;
    font-size: 30px;
    cursor: pointer;
}

/* mobile */
@media screen and (max-width: 768px) {
    #canvasWarpper {
        height: 300px;
    }
    #gameOverMsg {
        top: 4em;
        left: 6em;
        font-size: 35px;
    }
    #gameAgainBtn {
        top: 7em;
        left: 2.9em;
        width: 8em;
    }
}