Style.css

body{
    height: 100%;
    background: radial-gradient(circle,#fff,#ccc);
    background: -webkit-radial-gradient(circle,#fff,#ccc);
}
#container{
    width: 590px;
    height: 440px;
    padding: 20px;
    border-radius: 10px;
    margin: 100px auto;
    background-color: #9dd2ea;
    box-sizing: border-box;
    box-shadow: 0 4px 0 0 #009de4; 
    position: relative;
}
#score{
    background-color: #f1ff92;
    color: #888e5f;
    box-shadow: 0 4px 0 0 #9da853; 
/*    border-bottom: solid 4px #9da853;*/
    position: absolute;
    left: 500px;
    padding: 11px;
/*    float: right;*/
}
.text-center{
    text-align: center;
}
#correct,#wrong{
    background-color: #42e252;
    color: #fff;
    padding: 11px;
    position: absolute;
    left: 245px;
    display: none;
}
#wrong{
    background-color: #de401a;
    color: #fff;
}
#question{
    width: 450px;
    height: 150px;
    margin: 50px auto 10px auto;
    background-color: #9da0ea;
    border-radius: 3px;
    box-shadow: 0 4px 0 0 #535aa8;
    font-family: cursive,sans-serif;
    font-size: 100px;
    text-align: center;
    line-height: 150px;
}
#info{
    width: 450px;
    height: 50px;
    margin: 10px auto;
    background-color:#b481d9;
    box-shadow: 0 4px #8153a8;
    line-height: 50px;
    text-align: center;
}
#choices{
    width: 450px;
    height: 100px;
    margin: 8px auto;
}
.box{
    width: 85px;
    height: 85px;
    float: left;
    background-color: #fff;
    text-align: center;
    font-family: sans-serif;
    line-height: 85px;
    margin-right: 36px;
    border-radius: 3px;
    box-shadow: 0 4px rgba(0,0,0,0.2);
    cursor: pointer;
    position: relative;
    transition: all 0.2;
}
.box:active,#start-reset:active{
    top:4px;
    background-color: #9c89f6;
    color: #fff;   
    box-shadow: 0 0;
}
#box4{
    margin-right: 0px;
}
#start-reset{
    width: 100px;
    height: 35px;
    margin-top: 0px;
    line-height: 35px;    
    margin: 10px auto;
    float: none;
    background-color: rgba(255,255,255,0.5);
    border-radius: 3px;
    box-shadow: 0 4px rgba(0,0,0,0.2);
    cursor: pointer;
    position: relative;
    transition: all 0.2;
}
#timeremaining{
    width: 160px;
    height: 35px;
    line-height: 35px;
    position: absolute;
    bottom: 5px;
    right: 15px;    
    background-color: #afe64b;
    border-radius: 3px;
    box-shadow: 0 4px rgba(0,0,0,0.2);
    display: none;
}
#game-over{
    width: 500px;
    height: 200px;
    background: linear-gradient(#f3c76b,#f3746c);
    color: #fff;
    font-size: 2.5em;
    text-transform: uppercase;
    position: absolute;
    top: 100px;
    left: 45px;
    z-index: 2;
    display: none;
}