body {
    margin: 40px auto;
    max-width: 650px;
    line-height: 1.6;
    font-size: 18px;
    padding: 0;
    color: #404040;
}

h1, h2, h3 {
    line-height: 1.2;
}

img {
    width: 100%;
}

footer {
    text-align: center;
    padding: 30px 0;
}

ul {
    list-style-type: none;
    margin: 0;
    margin-left: 10px;
    padding: 0;
}

.flex-container {
    display: flex;
    justify-content: space-evenly;
}