body {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    min-height: 100vh;
    flex-flow: column nowrap;
}

.main{
    max-width: 700px;
}

p, h1, h2, h3 {
    font-family: Arial;
}

h2 {
    border-top: 1px solid black;
    padding-top: 10px;
    margin-top: 30px;
}