body {
    background-color: #000;
    margin: 0;
    padding: 0;
}

.mainContainer {
    background-image: url(../images/photo-main.jpg);
    height: 100vh;
    background-size: cover;
}

.logo {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.logo img {
    width: 300px;
}