:root {
  --header: #333333;
  --color: #000000;
  --article-color: #ffffff;
}

body {
  background-color: #eeeeee;
  margin: 0;
  padding: 0;
max-width: 100%;
box-sizing: border-box;
}

header {
  background-color: var(--header);
  color: var(--color);
  padding: 1em;
  width: 100%;
  max-height: 3.125em;
  overflow: hidden;
  margin: 0;
  position: fixed;
  left: 0;
  width: 100%;
  z-index: 1;
}

.section-header {
  background-color: var(--header);
  width: 100%;
  min-height: 3.125em;
  margin: 0;
  padding: 0;
}

.section-article {
  max-width: 100%;
  background-color: var(--article-color);
  padding: 1em 25%;
}

.section-article p {
color: var(--color);
font-size: 1.5em;
font-family: Arial;
margin: 0 0 10px 0;
max-width: 100%;
}

.section-article h1 {
color: var(--color);
font-size: 3.5em;
font-family: Arial;
margin: 0 0 10px 0;
text-align: center;
}

.section-article h2 {
color: var(--color);
font-size: 2.5em;
font-family: Arial;
margin: 0 0 10px 0;
max-width: 100%;
}

.section-article h3 {
color: var(--color);
font-size: 2em;
font-family: Arial;
margin: 0 0 10px 0;
max-width: 100%;
}

.section-article img {
margin: 0 0 15px 0;
max-width: 100%;
border-radius: 7px;
}

.section-article-color {
margin: 0 0 10px 0;
max-width: 100%;
border-radius: 7px;
padding: 20px 20px 10px 20px;
background-color: rgba(199, 244, 100, 0.5);
}

@media only screen and (max-width: 767px) {
.section-article {
  padding: 1em 1%;
}
}