body{
    margin:0;
    padding:0;
    box-sizing: border-box;
    background-color: #3D3D3D;
    width:100%;
    height:100vh;
}

section {
    width:100%;
    height: 100%;
}

div {
    display:flex; align-items:center; justify-content:center;
    width:100%;
    height: 100%;
}
h1 {
    font-size: 3em;
    font-family: Arial, Helvetica, sans-serif;
    color: white;
}

img {
    width: 300px;
}