* {
    box-sizing: border-box;
}
body {
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    font-size: 20px;
    line-height: 24px;
}

header, 
main {
    width: 80%;
    margin: 40px auto;
}
main {
    background-color: aquamarine;
    padding: 20px;
}
.news {
    display: flex;
    margin-bottom: 60px;
}

.news .left {
    flex: 1;
}
.news .right {
    flex: 1;
}
.gallery {
    display: flex;
    flex-wrap: wrap;
}
.gallery div {
    border: 1px solid red;
}
img {
    width: 100%;
}

.gallery div {
    flex: 25%;
}


h1,
h2,
h3 {
    font-family: Cambria, Cochin, Georgia, Times, 'Times New Roman', serif;
}
h1 {
    font-size: 60px;
    line-height: 68px;
    margin-bottom: 20px;
}
h2 {
    font-size: 32px;
    line-height: 36px;
    margin-top: 16px;
    margin-bottom: 12px;
}
h3 {
    font-size: 24px;
    line-height: 28px;
    margin-top: 16px;
    margin-bottom: 12px;
}