styles.css

/* ------- Reset ------- */
html {
    box-sizing: border-box;
    font-size: 16px;
  }
  
  *,
  *:before,
  *:after {
    box-sizing: inherit;
  }
  
  body,
  h1,
  h2,
  h3,
  h4,
  h5,
  h6,
  p,
  ol,
  ul {
    margin: 0;
    padding: 0;
    font-family: var(--ff-main);
    font-weight: normal;
  }
  
  ol,
  ul {
    list-style: none;
  }
  
  img {
    max-width: 100%;
    height: auto;
  }
  
  a {
    text-decoration: none;
    color: rgb(27, 27, 27);
  }

/* ---------------------- Utility Classes */

.error-field{
    background: rgb(118, 74, 74);
}

.error-field:focus{
    outline: solid 1px rgb(216, 53, 38);
    outline-offset: 3px;
    background-color: rgb(159, 119, 119);
}

.hidden{
    display: none;
}

.error-msg{
    max-width: 200px;
    color: rgb(255, 34, 34);
    font-size: 0.725rem;
    text-align: center;
    margin: 0 auto 20px auto;
    border-top: 2px solid rgb(255, 34, 34);
    border-bottom: 2px solid rgb(255, 34, 34);
    padding: 5px 0 4px 0;
}

/* ------- Main Styles ------- */

body {
    height: 100vh;
    font-family: sans-serif;
    font-weight: 600;
    background-color: rgb(36, 36, 36);
}

.background-gradient {
    height: 80vh;
    width: 70vw;

    background-image: radial-gradient(
        rgba(2290, 255, 255, 0.1) 5%,
        transparent 5%
    );

    background-position: 0% 0%;
    background-size: 12vmin 12vmin;
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    z-index: -99;
}

main {
    height: 100%;
    width: min(1100px, 90%);
    min-width: 900px;
    margin: 0 auto;
    padding: 0 60px;
    display: flex;
    flex-direction: row;
    gap: 100px;
    align-items: center;
    justify-content: space-between;
}
.form-area, .user-list-area {
    flex-direction: column;
    border-radius: 10px;
    overflow: hidden;
    background-color: rgb(26, 26, 26);

}
.form-area {
    width: 390px;
    height: max-content;
    position: relative;
}

form, .input-area, .label-area, article {
    display: flex;
}

form {
    flex-direction: row;
    width: 100%;
    gap: 30px;
    justify-content: center;
    padding: 30px;

}

.input-area, .label-area {
    flex-direction: column;
}

.label-area {
    justify-content: space-between;
    height: 250px;
    padding: 5px 0;
    text-align: right;
    color: white;
}

.input-area {
    justify-content: space-between;
    height: 250px;
}

input {
    width: 150px;
    height: 30px;
    color: white;
    background-color: rgb(62, 62, 62);
    border-radius: 5px;
    border: none;
    padding: 2px 5px;
}

input:focus {
    background-color: rgb(115, 115, 115);
    outline: none;
}

.submit-btn {
    height: 40px;
    width: 100%;
    border: none;
    color: white;
    font-weight: 800;
    font-size: 0.75rem;
    background-color: rgb(55, 55, 55);
}

.submit-btn:active {
    background-color: rgb(15, 15, 15);
}

.user-list-area {
    height: 350px;
    width: 250px;
}

ul {
    list-style-type: none;
    display: flex;
    align-items: center;
    flex-direction: column;
    gap: 20px;
    padding: 15px;
    overflow-y: auto;
}

li {
    width: 100%;
    height: 50px;
    border-radius: 7px;
    display: flex;
    flex-shrink: 0;
    flex-direction: row;
    overflow-x: hidden;
}

li:hover {
    .user-li {
        flex-shrink: 1;
    }
}

.user-li {
    height: 100%;
    width: 220px;
    display:  flex;
    flex-shrink: 0;
    flex-direction: row;
    justify-content: flex-end;
    gap: 20px;
    background-color: rgb(16, 16, 16);
    align-items: center;
    padding: 0 25px;
    transition: all 0.5s;
    transition-delay: 0.6s;
}



.user-li > * {
    flex-shrink: 0
}

.user-li-delete {
    height: 100%;
    width: 50px;
    display: flex;
    flex-shrink: 0;
    flex-direction: column;
    justify-content: center;
    color: white;
    background-color: rgb(21, 30, 39);
}

.user-li-delete:hover {
    background-color: rgb(45, 63, 82);
}

.user-li-delete:active {
    background-color: rgb(24, 10, 10);
    color: rgb(21, 30, 39);
}

.user-li-delete > i {
    margin: 0 auto;
}

#full-name {
    color: white;
    font-size: 0.85rem;
    font-weight: 600;
}

.age-container {
    height: 25px;
    width: 25px;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgb(58, 58, 58);

}

.age-container > h2 {
    font-size: 0.7rem;
}

@media (max-width: 900px) {

    html{
        scroll-behavior: auto;
    }

    body {
        height: 200vh;
    }

    main {
        width: min(700px, 85%);
        height: 200vh;
        min-width: 390px;
        flex-direction: column;
        justify-content: space-around;
        margin: 0 auto;
        scroll-snap-type: y mandatory;
    }
    
    .form-area {
        transform: translateY(5%);
        scroll-snap-align: start;
    }
    
    .user-list-area {
        width: 390px;
        margin-bottom: 70px;
        scroll-snap-align: start;
    }

    .user-li {
        width: 100%;
        justify-content: center;
    }
}