*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.parent-portal{
    width: 100vw;
    height: 100vh;
    position: relative;
    background-position: center;
    background-repeat: no-repeat;
    background-size: 100% 100%;
    background-image: url(./img/parent.jpg);
}