html {
    font-size: 16px;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    box-sizing: border-box;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: 100% 100%;
    transition: background-image 1s ease-in-out;
}

header {
    padding: 1.25rem;
    border-bottom: 0.0625rem solid gray;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    left: 0;
    width: 100%;
    z-index: 1000;
    box-sizing: border-box;
}

header.navbar {
    background-color: rgba(255, 255, 255);
    top: -3.125rem;
    transition: top 1s ease, opacity 1s ease;
    opacity: 0;
}

.navbar.show {
    top: 0;
    opacity: 1;
}

header.navbar2 {
    top: 0;
    background-color: rgba(255, 255, 255);
}

nav#nav1 {
    margin-left: 29.5rem;
}

nav#nav2 {
    margin-left: 55rem;
}

nav#nav3 {
    margin-left: 13rem;
}

nav#nav4 {
    margin-left: 10.5rem;
}

nav a {
    margin: 0 0.9375rem;
    text-decoration: none;
    background-color: rgba(255, 192, 203, 0.5);
    color: black;
    padding: 0.5rem 0.5rem;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: background-color 0.3s ease;
    display: inline-block;
    width: 5rem;
    text-align: center;
}

nav a:hover {
    background-color: red;
}

h1 {
    margin: 0 0;
    color: black;
    font-size: 3rem;
}