html, body, .background {
    height: 100%;
    width: 100%;
    margin: 0;
    font-family: 'Titillium Web', sans-serif;
}

.background {
    background: url(construction.jpg) no-repeat;
    background-size: cover;
    display: flex;
    justify-content: center;
    align-items: center;
}

.background div {
    background: rgba(255,255,255,0.7);
    flex-grow: 0;
    flex-shrink: 0;
    width: 65%;
    max-width: 600px;
    min-width: 300px;
    padding: 20px;
}