html {
  background: #bbb;
}

body {
  box-sizing: border-box;
  margin: 0 auto;
  padding: 3em 1em;
  background: #fff;
  font-family: "open sans", sans-serif;
  border: 1px #888 solid;
  border-top: none;
  width: 100%;
  max-width: 60em;
}

h1 {
  font-size: 1.35em;
  font-weight: 600;
  margin: 0 auto 0 auto;
  text-align: center;
}

img {
  border: 0.5em black solid;
  border-radius: 0.3em;
  width: 30em;
  max-width: 50%;
  float: right;
  margin: 0 0 0 0.8em;
}

@media (max-width: 45em) {
  img {
    display: none;
  }
}

p.copyr {
  font-size: 1.00em;
  margin: 0 auto 4.5em auto;
  opacity: 0.5;
  text-align: center;
}

h2 {
  font-size: 1.1em;
  font-weight: 600;
  margin: 2.5em 0 0 0;
  text-align: left;
}

p {
  font-size: 1.00em;
  margin: 0.5em 0 0 0;
  text-align: justify;
}

ul {
  margin: 0.5em;
  padding-left: 2em;
}

a.mateusz {
  text-decoration: none;
  color: inherit;
}