nav {
    display: flex;
    justify-content: left;
    width: 100%;
    margin: 0 auto;
}

.navbar a {
    color: #fff;
    position: relative;
    overflow: hidden;
    transition: opacity 0.3s ease;
}

.navbar a::before {
    content: "";
    position: absolute;
    width: 100%;
    height: 2px;
    background-color: #fff;
    bottom: 0;
    transform: scaleX(0);
    transform-origin: bottom right;
    transition: transform 0.3s ease;
}

.navbar a:hover {
    opacity: 0.7;
}

.navbar a:hover::before {
    transform: scaleX(1);
    transform-origin: bottom left;
}

.navbar div {
    padding: 10px;
}

header {
    background-color: #222;
}

.logo img {
    width: 80px;
}

.navbar {
    display: flex;
    margin-left: 20px;
}

.navbar div {
    padding: 30px 20px;
    display: block;
}

.navbar a {
    color: #fff;
}