body {
    background-color: #2D8394;
    margin: 0;
    padding: 0;
}

iframe {
    height: 50px;
    width: 100%;
}

.navbar {
    align-items: center;
    background-color: #333;
    display: flex;
    margin-left: 0;
    padding-left: 0;
    position: fixed;
    text-align: center;
    top: 0;
    width: 100%;
    transition: top 0.3s;
}
.navbar a {
    float: left;
    display: block;
    color: yellow;
    flex: 1;
    text-align: center;
    padding: 5px;
    text-decoration: none;
}