.content-div {
    width: 100%;
    min-height: calc(100vh - 220px);
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: rgb(240,240,240);
}
.content-div .form-div {
    width: 60%;
}

@media screen and (max-width:768px) {
    .content-div {
        min-height: calc(100vh - 160px);
    }
    .content-div .form-div {
        width: 90%;
    }
}