body {
    position: relative;
}

.side {
    background-image: url("../images/blue-leaf.jpg");
    background-repeat: no-repeat;
    background-size: cover;
    width: 250px;
    height: 100vh;
    margin-right: 20px;
    border: 0;
}

.logo {
    background-image: url("../images/logo/large.png");
    width: calc(100vw - 290px);
    height: 500px;
    background-repeat: no-repeat;
    background-size: contain;
    border: 0;
    margin-left: 290px;
}