body{max-width:900px;margin:0 auto;font-family:Helvetica,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol"}
header{display:grid;grid-template-columns:1fr 200px;gap:30px;padding:0 9px 21px 9px}
header img{width:100%;align-self:center;max-width:300px}
header main{align-self:center;line-height:1.5}
header aside{font-size:85%;grid-column:1/3}
strong{color:red;font-size:120%}
iframe{box-sizing:border-box;padding:9px}
footer{border-top:1px solid rgba(0, 0, 0, 0.15);display:flex;justify-content:space-evenly;padding-top:9px}
footer img{height:100px}

@media (min-width: 600px) {
    header{grid-template-columns:200px 1fr}
    header img{width:200px}
}