* {
    box-sizing: border-box;
}

html, body {
    padding: 0;
    margin: 0;
    overflow: hidden;
    font-family: Helvetica, Arial, sans-serif;
    width: 100%;
    height: 100%;
}

.wrapper {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    width: 100%;
}

#start_btn {
    margin-top: 30px;
    padding: 10px 30px;
    background: beige;
    display: inline-block;
}

#back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
}

.image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

iframe {
    width: 256px;
    height: 192px;
    float: left;
    margin: 10px;
}

#final_time_cont {
    display: none;
    background: #2fb457;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1000;
    color :white;;
}

.final_text {
    position: absolute;
    top: 50px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 140px;
}

#final_time {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    text-align: center;
    font-size: 120px;
}

.display{
    background-image: url("/images/Start_Gomb.jpg");
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    width: 100%;
    height: 100%;
}
#restart {
    position: absolute;
    top: 25%;
    left: 50%;
    width: 69%;
    height: 50%;
    transform: translate(-50%);
}