@import url(https://fonts.googleapis.com/css?family=Poppins:300,400,500,600,700);
body {
    font-family: 'Poppins', Arial, Helvetica, sans-serif;
    background: linear-gradient(#d5d5d5, #ffffff);
    min-height: 100vh;
    color: #3a3a3a;
    padding: 0;
    margin: 0;
}

header, footer {
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    background: #6a6a6a;
}

footer {
    bottom: 0;
    color: #ffffff;
}

.header-logo {
    height: auto;
    width: 10rem;
}

header ul {
    display: flex;
    align-items: center;
    list-style: none;
    height: 100%;
}

header ul li a {
    color: #ffffff;
    text-decoration: none;
    padding: 10px;
    border-radius: 5px;
    background: #646161;
}

header ul li a:hover,
header ul li a.active {
    color: #ffffff;
    background: #2f2f2f;
}