app.css

*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    border-spacing: 0;
}

html, body {height: 100%;}

body{
    height: 100%;
    width: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

#wrapper{
    width: 80%;
    height: 80%;
    margin: 3% auto;
    outline: 10px dashed #DDDDDD;
    background-color: #EEEEEE;
    cursor: pointer;
    text-align: center;
}

#area{
    font-size: 5.5vh;
    color: #999999;
    position: relative;
    top: 20%;
}

#area small{
    display: block;
    font-size: 3.3vh;
}

#area input{
    display: none;
}

footer{
	display: none;
    background-color: #EEEEEE;
    width: 100%;
    position: fixed;
    bottom: 0;
    padding: 10px;
    text-align: center;
}

footer button{
    padding: 10px;
    margin: 5px;
}