/* Logo styling */
header {
    padding: 10px 20px;
    background: #ffffff; /* header background */
    display: flex;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

header .logo img {
    height: 100px;   /* adjust logo height */
    width: auto;    /* keep proportions */
}