.header-menu {
    background-color: #FF6B6B;
    padding: 15px 0;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.header-menu ul {
    display: flex;
    justify-content: center;
    list-style-type: none;
    margin: 0;
    padding: 0;
}

.header-menu li {
    margin: 0 20px;
}

.header-menu a {
    color: white;
    text-decoration: none;
    font-size: 18px;
    font-weight: bold;
    padding: 10px 12px;
    border-radius: 10px;
    transition: background-color 0.3s, color 0.3s, transform 0.3s;
}

.header-menu a:hover {
    background-color: #FF4550;
    color: #fff;
    transform: scale(1.1);
}

.header-menu a:active {
    transform: scale(0.95);
}