@media screen and (max-height: 640px) {
    .container.container-single{
        padding-top: 3px !important;
    }
}
#gamebox {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 442px;
    width: 750px;
    background-color: #111;
    margin: 2px;
    position: relative;
}

canvas {
    background-color: #161c1c;
    border: 2px solid #313131;
    padding: 0;
    margin: 0;
    position: absolute;
    width: 100%;
    top: 0;
}

#gameover {
    position: absolute;
    display: none;
    top: 0px;
    margin: 0 auto;
    /*width: 400px;*/
    width: 750px;
    height: 442px;
    text-align: center;
    vertical-align: middle;
    position: absolute;
    background-color: rgba(22, 28, 28, 0.95);
    z-index: 2;
}
#gameover #msg {
    font-family: Arial;
    font-size: 24px;
    color: #ccc;
    margin: 0 auto;
    margin-top: 175px;
}
#restartbtn {
    display: block;
    margin: 16px auto;
    width: 120px;
    padding: 6px;
    background-color: #00BB00;
    font-family: Arial;
    font-size: 24px;
    color: red;
    border-radius: 10px;
    text-decoration: none;
    cursor: pointer;
}