body {
    font-family: "Open Sans", Ubuntu, Arial, sans-serif;
    font-size: 18px;
    line-height: 1.6;
    color: #333;
    margin: 0;
}

h1 {
    font-weight: 600;
    line-height: 1.2;
    color: white;
}

a {
    color: #2196f3;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

a:visited {
    color: #3f51b5;
}

ul {
    list-style-type: square;
}

.header {
    background: #5f5aa5;
    padding: 20px 0;
}

.main {
    box-sizing: border-box;
    width: 800px;
    max-width: 100%;
    margin: 0 auto;
    padding: 0 3rem;
}

@media (max-width: 600px) {
    h1 {
        font-size: 26px;
    }

    .main {
        padding: 0 1rem;
    }
}

@media (max-width: 400px) {
    h1 {
        font-size: 22px;
    }
}