.background-left {
    position: absolute;
    width: 600px;
    height: 780px;
    left: -5%;
    top: 11%;
}

.background-right {
    position: absolute;
    right: 0;
    top: 2%;
    width: 300px;
    height: 820px;
}

@media screen and (max-width: 900px) {
    .background-left {
        max-width: 600px;
        width: 100%;
        top: 10%;
        left: -10%;
    }

    .background-right {
        display: none;
    }
}