.main {
    background: #8271DC;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-content: center;
    width: 100vw;
    height: 100vh;
    background: url("../images/bg.png") no-repeat;
    background-size: cover;
}

.gd-form {
    background: #fff;
    width: 90%;
    padding: 20px;
    border-radius: 15px;
    height: 280px;
    margin-top: 40%;
    margin-left: auto;
    margin-right: auto;
}

@media screen and (min-width: 600px) {
    .gd-form {
        margin-top: 20%;
    }
}