#logo {
    background-image: url('/img/HelAirTech_logo_bg.png');
    background-size: cover;
    background-position: center center;
}

#counter {
    background-image: url('/img/counter_bg.png');
    background-position: center center;
    background-size: cover;
}

#header {
    background: rgba(0, 0, 0, 0.7) url('/img/header_bg.jpg');
    background-position: center center;
    background-size: cover;
    background-blend-mode: darken;
    min-height: 636px;
}