* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    display: flex;
    height: 100vh;
    justify-content: center;
    align-items: center;
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
    overflow: hidden;
    background-image: linear-gradient(135deg, #ABDCFF 10%, #0396FF 100%);
}
.container {
    width: 300px;
    box-shadow: 3px 2px 12px rgba(0,0,0,.25);
    overflow: hidden;
}
.header {
    background-image: linear-gradient(135deg, #0fa3e7 10%, #91c0d1 100%);
    color: #fff;
    padding: 20px 30px;
}
.header > .title {
    margin:.3em 0;
}
.header > .subtitle{
    display: inline-block;
    margin:.1em 0 .6em;
    opacity: .85;
}
.header > .search {
    display: inline-block;
    width: 100%;
    padding: 12px 16px;
    background-color: rgba(0,0,0,.5);
    color: #fff;
    font-size: 14px;
    outline: none;
    border-radius: 15px;
    border: 0;
}
.user-list {
    max-height: 400px;
    overflow-y: auto;
    list-style: none;
    background-color: #fff;
}
.user-list li {
    display: flex;
    padding: 20px;
    align-items: center;
}
.user-list li:not(:last-of-type) {
    border-bottom: 1px solid #e5e6e7;
}
.user-list li img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
}
.user-list li .user-info {
    margin-left: 10px;
}
.user-list li .user-info h4 {
    margin-bottom: 10px;
}
.user-list li .user-info p {
    font-size: 12px;
}
.user-list li.hide {
    display: none;
}
::-webkit-scrollbar {
    width: 10px;
    height: 8px;
    background-image: linear-gradient(135deg, #eaeff3 10%, #d6d9db 100%);
}
::-webkit-scrollbar-thumb {
    width: 4px;
    height: 4px;
    background-image: linear-gradient(135deg, #56abf0 10%, #159af3 100%);
}