:root {
  --background-color: #e5e5e5;
  --text-color: #404040;
}

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

body {
  background-color: var(--background-color);
  color: var(--text-color);
  font-family: serif;
  font-size: 16px;
  font-weight: lighter;
  margin: 0;
  padding: 20px;
}

a, a:visited {
  color: #4d7ba3;
}

a:hover {
  filter: brightness(125%);
}

h1, h2, h3 {
  font-weight: normal;
}

h2 {
  text-decoration: underline;
}

hr {
  border: none;
  border-top: 1px dotted var(--text-color);
  margin: 2em 0 1em 0;
}

p {
  margin: .5em 0;
}

#header {
  align-items: center;
  display: flex;
  gap: 15px;
}

#header h1 {
  margin: 0 0 .25em 0;
}

#header ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
}

#header #brand {
  height: 100px;
}

#header #brand svg {
  height: 100%;
  width: auto;
}

#navigation ul {
  display: flex;
  gap: 20px;
  list-style-type: none;
  padding: 0;
}

main {
  margin-left: max(0px, calc((100% - 700px) / 2));
  max-width: 700px;
  transition: margin-left 0.15s ease;
}

main img {
  max-width: 100%;
}

@media (max-width: 1200px) {
  main {
    margin-left: 0;
  }
}