body {
margin: auto;
text-align: center;
}
main {
margin: auto;
width: 500px;
height: 500px;
margin: auto;
background-color: white;
box-shadow: 20px 20px rgba(0, 0, 0, .15);
border-style: solid;
}
#div-root {
padding: 10px;
position: relative;
}
.hint {
position: fixed;
left: 30px;
top: 30px;
padding: 30px;
max-width: 300px;
background-color: lightslategray;
z-index: 1;
}