:root {
  --dark-grey: hsl(0, 0%, 31%);
  --grey: hsl(0, 0%, 74%);
  --main: hsl(226, 43%, 60%);
  --main-dark: hsl(226, 43%, 45%);
  --bg: hsl(0, 43%, 96%);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Avenir", "Avenir Next", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.5;
  background-color: var(--bg);
  color: var(--dark-grey);
}

p {
  margin-top: 0;
}

.header {
  padding: 2rem;
  background-color: var(--main);
  text-align: center;
}

.title-image {
  width: 500px;
  max-width: 100%;
}

.tagline {
  font-size: 1rem;
  line-height: 2;
  color: #fff;
  font-weight: normal;
}

.tagline img {
  position: relative;
  top: 8px;
  height: 1.5rem;
  margin: 0 0.2rem;
}

@media (min-width: 600px) {
  .tagline {
    font-size: 1.5rem;
  }

  .tagline img {
    top: 10px;
    height: 2rem;
  }
}

.tagline .tagline-first-word {
  margin-right: 0;
}

.main {
  padding: 2rem 0;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 2rem;
}

.contribute {
  margin-bottom: 2rem;
  text-align: center;
}

.sites {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  grid-auto-rows: 15rem;
  grid-gap: 2rem;
  justify-items: center;
  padding: 0;
  list-style: none;
}

.site {
  width: 100%;
}

.site-url {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  border: 1px solid var(--grey);
  border-radius: 10px;
  background-color: #fff;
  overflow: hidden;
  color: #fff;
  text-decoration: none;
  transition: all 0.2s ease-in-out;
}

.site-url:hover,
.site-url:focus {
  border: 1px solid var(--main-dark);
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.25);
}

.site-url:hover .site-title, .site-url:focus .site-title {
  background-color: var(--main-dark);
}

.site-thumbnail-wrapper {
  position: relative;
  height: 100%;
  background-color: #fff;
}

.site-thumbnail {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  height: calc(100% - 1rem);
  width: calc(100% - 1rem);
  object-fit: contain;
}

.site-title {
  padding: 1rem;
  text-align: center;
  background-color: var(--main);
  transition: background-color .2 ease-in-out;
}

.footer {
  text-align: center;
}