body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f9f9f9;
}
.container {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background: #fff;
    text-align: center;
}
.profile {
    width: 150px;
    height: 150px;
    border-radius: 50%;
}
.banner img {
    width: 100%;
    height: auto;
}
ul {
    list-style: none;
    padding: 0;
}
li {
    margin: 10px 0;
}
a.btn {
    display: inline-block;
    margin: 10px;
    padding: 10px 20px;
    background: #333;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
}
a.btn:hover {
    background: #555;
}
.bottom-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 50%;
    z-index: 999;
}

.bottom-banner img {
    width: 50%;
    height: auto;
    max-height: 80px;
    object-fit: cover;
}
.container {
    padding-bottom: 100px; /* leaves space for footer */
}