* {
margin:0;
padding:0;
}

html, body {
height: 100%;
width: 100%;
}

#distance {
width: 10px;
height: 50%;
margin-bottom: -250px;
float: left;
}

#container {
margin: 0 auto;
position: relative;
height: 500px;
width: 700px;
clear: left;
display: flex;
align-items: center;
justify-content: center;
}