rt.css

*{
    margin:0%;
    padding:0%;
}
.body {
    background-color: lightgrey;
}
.hero{
    height: 100%;
    width: 100%;
    background-image: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)),
    url(background.jpg);
    background-position: center;
    background-size: cover;
    position: absolute;
}

/*  for form */
.form-box{
    width: 450px;
    height: 480px;
    position: absolute;
    right:10px;
    margin: 6% auto;
    background: #fff;
    padding: 2px;
    overflow: hidden;
}
.button-box{
    width: 220px;
    margin: 35px auto;
    position: relative;
    border-radius: 30px;
}
.toggle-btn{
    transition: all .3s;
    padding: 10px 30px;
    cursor: pointer;
    background: rgba(250,128,144,0.3);
    border: 1px;
    outline: none;
    position: relative;
    color: white;
    font-weight: bold;
}

.toggle-btn.selected {
    background: #fa1b08;
}

.input-group{
    top: 180px;
    position:absolute;
    right: 10px;
    width:280px;
    transition:0.5s;
}
.input-field{
    transition: all .3s;
    position: relative;
    margin: 5px 15px;
    border: 1px solid rgba(255,127,80,0.2);
    border-radius: 5px;
    width: 100%;
    outline: none;
    padding: 10px;
}
.input-field:focus {
    border: 1px solid rgba(255,127,80,1);
    border-radius: 10px;
}

.input-field:hover {
    cursor: text;
}

#submit-btn {
    transition: all .3s;
    width: 69%;
    color: white;
    padding: 10px 30px;
    cursor: pointer;
    display:block;
    margin: auto;
    border: 1px solid white;
    background-color: #fa1b08;
    outline: none;
    border-radius: 24px;
}

#submit-btn:hover {
    background: white;
    border: 1px solid #fa1b08;
    color: #fa1b08;
}

#registration-form div, #login-form div {
    display: flex;
    justify-content: space-around;
    align-items: center;
}
[id$="-form"] {
    transition: all 1s, opacity .3s;
    width: 100%;
    position: relative;
    left: 50%;
    transform: translate(-51%);
}

#login-form {
    opacity: 0;
    position: absolute;
    transform: translate(51%);
}

#form-container {
    transition: all 1s;
    height: 250px;
}