html,
body {
    height: 100%;
    margin: 0;
}

body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    cursor: pointer;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
}

#score {
    position: absolute;
    color: aliceblue;
    top: 30px;
    right: 30px;
    font-size: 2em;
    font-weight: 900;
}

#introduction {
    width: 200px;
    height: 150px;
    position: absolute;
    color: rgb(204, 205, 205);
    font-weight: 600;
    font-size: 0.8em;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    text-align: center;
    transition: opacity 2s;
}

#restart {
    width: 120px;
    height: 120px;
    position: absolute;
    border-radius: 50%;
    color: white;
    background: rgb(2, 0, 36);
    background: linear-gradient(90deg, rgba(2, 0, 36, 1) 0%, rgba(9, 9, 121, 1) 35%, rgba(30, 149, 173, 1) 100%);
    border: none;
    font-weight: 700;
    font-size: 1.2em;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    display: none;
    cursor: pointer;
}

#perfect {
    position: absolute;
    opacity: 0;
    transition: opacity 2s;
}

#youtube,
#youtube-card {
    display: none;
}

@media (min-height: 425px) {
    #youtube {
        z-index: 2;
        display: block;
        width: 100px;
        height: 70px;
        position: absolute;
        bottom: 20px;
        left: 20px;
        background: rgb(82, 78, 78);
        border-radius: 50% / 11%;
        transform: scale(0.8);
        transition: transform 0.5s;
    }
    #youtube:hover,
    #youtube:focus {
        transform: scale(0.9);
    }
    #youtube::before {
        content: "";
        display: block;
        position: absolute;
        top: 1.5%;
        left: -6%;
        width: 112%;
        height: 85%;
        background: rgb(67, 58, 221);
        background: linear-gradient(90deg, rgba(67, 58, 221, 1) 0%, rgba(11, 37, 24, 1) 37%, rgba(30, 240, 219, 1) 100%);
        border-radius: 9% / 50%;
    }
    #youtube::after {
        content: "";
        display: block;
        position: absolute;
        top: 20px;
        left: 40px;
        width: 45px;
        height: 30px;
        border: 15px solid transparent;
        box-sizing: border-box;
        border-left: 30px solid white;
    }
    #youtube span {
        font-size: 0;
        position: absolute;
        width: 0;
        height: 0;
        overflow: hidden;
    }
    #youtube:hover+#youtube-card {
        display: block;
        position: absolute;
        bottom: 12px;
        left: 10px;
        padding: 25px 25px 25px 130px;
        width: 300px;
        background-color: white;
    }
}

#mmd {
    position: relative;
    margin-top: -695px;
    margin-left: 20px;
}