html,body{
    padding:0;
    margin:0;
    height:100%;
}
#calibration{
    display: none;
    height: 100%;
    width: 100%;
}
.section{
    width: 49.5%;
    height: 49%;
    float: left;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center; 
}
.lookHere{
    height: 100px;
    width: 100px;
    border: 1px solid #000;
    position: absolute;
    display: inline-block;
    vertical-align: middle;
    display: none;
}
.lookHere:active{
    background-color: red;
}
#instruction{
    width: 100%;
    height: 100%;
    text-align: center;
    display: table;
}

#instruction p{
    display: table-cell;
    vertical-align: middle;
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 25pt;
}
#startButton{
    display: table-cell;
    vertical-align: middle;
    text-align: center;
    width: 100px;
    height: 50px;
    font-size: 15pt;
    background-color: #fff;
}
#timerSlot{
    font-size: 100pt;
}