style.css

/*-----------------  GOOGLE FONTS  -----------------*/
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@200;300;500;600&display=swap');

/*-----------------  VARIABLES  -----------------*/
:root {
    /* Colors */ 
    --orange-color: rgb(246, 99, 53);
    --white_color: rgb(255, 255, 255);
    --linear_gradient: linear-gradient(rgba(0,0,0,0.4),rgba(0,0,0,0.4));
    --black_color: rgb(0, 0, 0);
    --success_color: rgb(138, 232, 90);
    --danger_color: rgb(255, 71, 71);
}
html {
    font-size: 10px;
    /* Now 1rem = 10px */
}
/*-----------------  Base  -----------------*/
* {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
    font-family: 'Poppins', sans-serif;
}
/*-----------------  Styling Start  -----------------*/
.container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    width: 100%;
    background-image:var(--linear_gradient),url(background.jpg);
    background-position: center;
    background-size: cover;
    transition: 0.5s ease;
    transform-style: preserve-3d;
    perspective: 100rem;
}
.form_box {
    width: 38rem;
    height: 55rem;
    margin: 6% auto;
    padding: 0.5rem;
    color: var(--white_color);
    border: 0.1rem solid rgba(255, 255, 255, 0.3);
    background:rgba(255, 255, 255, 0.2);
    border-radius: 1.6rem;
    box-shadow: 0 0.4rem 3rem rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(0.5rem);
    overflow: hidden;
}
.btn_box {
    width: 22rem;
    margin: 3.5rem auto;
    position: relative;
    box-shadow: 0 0 2rem 0.9rem #1b1f2955;
    border-radius: 3rem;
}
.toggle_btn {
    padding: 1rem 3rem;
    cursor: pointer;
    background: transparent;
    border: 0;
    outline: none;
    position: relative;
    transition: 0.3s;
    font-weight: 600;
}
.toggle_btn:hover {
    color: var(--white_color);
}
#btn {
    top: 0;
    left: 0;
    position: absolute;
    width: 11rem;
    height: 100%;
    border-radius: 3rem;
    background:var(--orange-color);
    transition: 0.5s;
    font-weight: 600;
}
.social_icons {
    text-align: center;
}
.social_icons .icon {
    width: 3.6rem;
    height: 3.6rem;
    margin: 0 1.2rem;
    font-size: 1.6rem;
    box-shadow: 0 0 2rem 0.9rem #1b1f2955;
    cursor: pointer;
    border-radius: 50%;
    color: var(--black_color);
    padding-top: 1rem;
    background: transparent;
    transition: 0.2s;
}
.social_icons .icon:hover {
    background: var(--orange-color);
    color: var(--white_color);
}
.form_div {
    width: 100%;
    margin-top: 2rem;
    position: relative;
    height: 4.8rem;
    margin-bottom: 2.4rem;
}
.input_group {
    top: 18rem;
    position: absolute;
    width: 28rem;
    transition: 0.5s;
}
.form_input {
    font-size: 1.6rem;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    box-shadow: 0 0 2rem 0.9rem #1b1f2955;
    border-radius: 0.8rem;
    outline: none;
    padding: 1.6rem;
    background: transparent;
    z-index: 1;
    transition: 0.3s;
}
.form_label {
    position: absolute;
    left: 1.6rem;
    top: 1.6rem;
    padding: 0 0.4rem;
    background-color: transparent;
    color: var(--black_color);
    font-size: 1.6rem;
    transition: 0.3s;
}
.form_input:focus + .form_label {
    top: -0.8rem;
    left: 1rem;
    color: var(--white_color);
    font-size: 1rem;
    font-weight: 500;
    z-index: 10;
    background-color: var(--orange-color);
    border-radius: 1rem;
    padding: 0 0.5rem;
}
.form_input:not(:placeholder-shown).form_input:not(:focus)+ .form_label {
    top: -0.8rem;
    left: 1rem;
    font-size: 1rem;
    font-weight: 500;
    background-color: var(--orange-color);
    border-radius: 1rem;
    color: var(--white_color);
    z-index: 10;
}
.form_input:focus {
    border: 0.15rem solid var(--orange-color);
}
.submit_btn {
    width: 85%;
    position: relative;
    padding: 1rem 3rem;
    cursor: pointer;
    display: block;
    margin: auto;
    background-color:transparent;
    box-shadow: 0 0 2rem 0.9rem #1b1f2955;
    border: 0;
    outline: none;
    overflow: hidden;
    font-weight: 600;
    border-radius: 3rem;
    transition: 0.5s;
}
.submit_btn:hover {
    color: var(--white_color);
    background-color: var(--orange-color);
}
.submit_btn span {
    position: absolute;
    background: var(--white_color);
    transform:translate(-50%, -50%);
    border-radius: 50%;
    animation: btnAnim 1s linear infinite;
}
@keyframes btnAnim {
    0%{
        width: 0rem;
        height: 0rem;
        opacity: 1;
    }
    100%{
        width: 50rem;
        height: 50rem;
        opacity: 0;
    }
}
.checkbox {
    margin: 2rem 1rem 3rem 0.5rem;
    box-shadow: 0 0 2rem 0.5rem #1b1f2955;
    accent-color: var(--success_color);
    cursor: pointer;
}
.check_text {
    color: var(--black_color);
    font-size: 1.2rem;
    bottom: 6.8rem;
    position: absolute;
}
#login {
    left: 5rem;
}
#register {
    left: 45rem;
}
.error-msg {
    display: block;
    position: relative;
    font-size: 1.4rem;
    padding-left: 0.5rem;   
}
.danger-color {
    color: var(--danger_color);
}
.error {
    border-color: var(--danger_color);
}
.valid {
    color: var(--success_color);
}
.hide {
    display: none;
}
.showbtn {
    position: absolute;
    right: 1rem;
    top: 0.8rem;
    width: 3.4rem;
    font-size: 1.6rem;
    color: var(--black_color);
    height: 3.4rem;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    z-index: 100;
    justify-content: center;
    align-items: center;
}
.password_validation {
    margin-top: 1.5rem;
}
.password_validation ul li {
    list-style: none;
    color: var(--black_color);
    font-size: 1.4rem;
    padding-left: 0.5rem;   
}
.password_validation ul li.valid {
    color: var(--white_color);
}
.password_validation ul li::before {
    content:'\f192';
    font-family: fontAwesome;
    width: 2rem;
    height: 1rem;
    display: inline-flex;
}
.password_validation ul li.valid::before {
    content: '\f00c';
    color: var(--success_color);
} 
.popup {
    width: 30rem;
    background-color: var(--white_color);
    border-radius: 1rem;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.1);
    text-align: center;
    padding: 0 3rem 3rem;
    color: var(--black_color);
    visibility: hidden;
    transition: transform 0.4s, top 0.4s;
}
.popup .valicon {
    font-size: 4rem;
    height: 6rem;
    width: 6rem;
    padding: 1rem;
    margin-top: -3rem;
    color: var(--white_color);
    background-color: var(--success_color);
    border-radius: 50%;
    box-shadow: 0 0.2rem 0.5rem rgba(0, 0, 0, 0.5);
}
.popup .erroricon {
    font-size: 4rem;
    height: 6rem;
    width: 6rem;
    padding: 1rem;
    margin-top: -3rem;
    color: var(--white_color);
    background-color: var(--danger_color);
    border-radius: 50%;
    box-shadow: 0 0.2rem 0.5rem rgba(0, 0, 0, 0.5);
}
.popup h2 {
    font-size: 2.5rem;
    font-weight: 500;
    margin: 3rem 0 1rem;
}
.popup .ok_btn {
    margin-top: 3rem;
    width: 100%;
    padding: 1rem 0;
    background-color: var(--success_color);
    color: var(--white_color);
    border: 0;
    outline: none;
    font-size: 1.8rem;
    border-radius: 0.4rem;
    cursor: pointer;
    font-weight: 500;
    box-shadow: 0 0.5rem 0.5rem rgba(0, 0, 0, 0.3);
}
.open_popup {
    visibility: visible;
    top: 50%;
    transform: translate(-50%, -50%) scale(1);
}