style.css

* {
    font-family: "Playpen Sans", cursive;
}

/* Mute icon style*/
#muteBtnImage {
    position: fixed;
    bottom: 8px;
    left: 16px;
    width: 3.5%;
    cursor: pointer;
}

/* Styles the instructions */
#instructions {
    font-optical-sizing: auto;
    font-weight: 500;
    font-style: normal;
    color: white;
    position: relative;
    top: 160px;
    font-size: 45px;
}

#txtCounter {
    font-optical-sizing: auto;
    font-weight: 500;
    font-style: normal;
    color: white;
    position: relative;
    top: 230px;
    font-size: 40px;
}

/* Sets Gawr Gura plushie position */
#GawrGura {
    position: relative;
    display: block;
    transform: translate(-50%, -50%);
    left: 50%;
    top: 50%;
    cursor: pointer;
}

/* It's Gura Dancin! (default transparency is 0) */
#DancinGura {
    position: absolute;
    display: block;
    left: 50%;
    top: 75%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 10s;
}

/* Popup style */
.popup .overlay{
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.7);
}

.popup .content{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #fff;
    width: 450px;
    height: 220px;
    z-index: 2;
    text-align: center;
    padding: 20px;
    border-radius: 15px;
    box-sizing: border-box;
}

.popup .close-btn{
    cursor: pointer;
    position: absolute;
    left: 50%;
    right: 50%;
    top: 90%;
    transform: translate(-50%, -50%);
    width: 90px;
    height: 30px;
    background: #222;
    color: #fff;
    font-size: 17px;
    line-height: 30px;
    border-radius: 7px;
    text-align: center;
}

.popup .content h1 {
    position: absolute;
    left: 45%;
    right: 60%;
    transform: translate(-50%, -50%);
}

.popup .content p {
    position: absolute;
    top: 60px;
    left: 20px;
    right: 20px;
    line-height: 1.5;
    transform: translateX(-50%, -50%);
    color: #666;
}