HTMLify

html {
    height: 100%;
    background: radial-gradient(circle, #fff, #ccc);
    background: -webkit-radial-gradient(circle, #fff, #ccc);
    background: -o-radial-gradient(circle, #fff, #ccc);
    background: -moz-radial-gradient(circle, #fff, #ccc);
}

#container {
    height: 400px;
    width: 550px;
    background-color: #cbd5e1;
    margin: 100px auto;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0px 4px 0px 0px #ef4444;
    position: relative;
}

#score {
    border-radius: 20px;
    background-color: #1e293b;
    color: #e2e8f0;
    padding: 11px;
    position: absolute;
    left: 500px;
    box-shadow: 0px 4px 0px #1e293b;
}

#correct {
    position: absolute;
    left: 260px;
    background-color: #42e252;
    color: white;
    padding: 11px;
    display: none;
}

#wrong {
    position: absolute;
    left: 250px;
    background-color: #de401a;
    color: white;
    padding: 11px;
    display: none;
}

#question {
    width: 450px;
    height: 150px;
    margin: 50px auto 10px auto;
    background-color: #f9fafb;
    box-shadow: 0px 4px #f9fafb;
    -moz-box-shadow: 0px 4px #f9fafb;
    -webkit-box-shadow: 0px 4px #f9fafb;
    font-size: 100px;
    text-align: center;
    font-family: cursive, sans-serif;
    color: black;
}

#instruction {
    width: 450px;
    height: 50px;
    background-color: #ef4444;
    margin: 10px auto;
    text-align: center;
    line-height: 45px;
    box-shadow: 0px 4px #ef4444;
    -moz-box-shadow: 0px 4px #ef4444;
    -webkit-box-shadow: 0px 4px #ef4444;
}

#choices {
    width: 450px;
    height: 100px;
    margin: 5px auto;
}

.box {
    width: 85px;
    height: 85px;
    background-color: white;
    float: left;
    margin-right: 36px;
    border-radius: 3px;
    cursor: pointer;
    box-shadow: 0px 4px rgba(0, 0, 0, 0.2);
    -moz-box-shadow: 0px 4px rgba(0, 0, 0, 0.2);
    -webkit-box-shadow: 0px 4px rgba(0, 0, 0, 0.2);
    text-align: center;
    line-height: 80px;
    position: relative;
    transition: all 0.2s;
    -webkit-transition: all 0.2s;
    -moz-transition: all 0.2s;
    -o-transition: all 0.2s;
    -ms-transition: all 0.2s;
}

.box:active,
#startreset:active {
    background-color: #475569;
    color: white;
    box-shadow: 0px 0px #475569;
    -moz-box-shadow: 0px 0px #475569;
    -webkit-box-shadow: 0px 0px #475569;
    top: 4px;
}

#box4 {
    margin-right: 0;
}

#startreset {
    width: 78px;
    padding: 10px;
    background-color: #ef4444;
    margin: 0 auto;
    border-radius: 3px;
    cursor: pointer;
    box-shadow: 0px 4px rgba(0, 0, 0, 0.2);
    -moz-box-shadow: 0px 4px rgba(0, 0, 0, 0.2);
    -webkit-box-shadow: 0px 4px rgba(0, 0, 0, 0.2);
    text-align: center;
    position: relative;
    transition: all 0.2s;
    -webkit-transition: all 0.2s;
    -moz-transition: all 0.2s;
    -o-transition: all 0.2s;
    -ms-transition: all 0.2s;
}

#timeremaining {
    width: 152px;
    padding: 10px;
    position: absolute;
    top: 395px;
    left: 400px;
    background-color: rgba(181, 235, 36, 0.8);
    border-radius: 3px;
    box-shadow: 0px 4px rgba(0, 0, 0, 0.2);
    -moz-box-shadow: 0px 4px rgba(0, 0, 0, 0.2);
    -webkit-box-shadow: 0px 4px rgba(0, 0, 0, 0.2);
    /*    visibility: hidden;*/
    display: none;
}

#gameOver {
    height: 200px;
    width: 500px;
    background: linear-gradient(#F3CA6B, #F3706C);
    background: -webkit-linear-gradient(#F3CA6B, #F3706C);
    background: -o-linear-gradient(#F3CA6B, #F3706C);
    background: -moz-linear-gradient(#F3CA6B, #F3706C);
    color: white;
    font-size: 2.5em;
    text-align: center;
    text-transform: uppercase;
    position: absolute;
    top: 100px;
    left: 45px;
    z-index: 2;
    display: none;
}