:root {
  --dark-background-color: #313338;
  --header-height: 70px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

button {
  cursor: pointer;
}

header {
  background-color: var(--dark-background-color);

  padding: 0 30px;

  display: flex;
  align-items: center;
  justify-content: space-between;

  height: var(--header-height);
  flex-shrink: 0;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid lightgrey;
}

header > img {
  height: 40px;
}

.layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

header > h1 {
  color: white;
  text-align: left;
  flex-grow: 1;
  padding-left: 10px;
}

.sidebar {
  width: 250px;
  background-color: #2b2d31;
  padding: 20px;
  height: 100%;
  overflow-y: auto;
}

.sidebar > nav > ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar > nav > ul > li > a {
  display: block;
  cursor: pointer;
  text-decoration: none;
  color: white;

  padding: 10pt 15pt;
  border-radius: 4px;
  transition: background-color 0.2s ease;
  font-size: larger;
}

.sidebar li.active > a {
  background-color: #404249;
}

.sidebar li > a:hover {
  background-color: #36383e;
}

.content {
  flex: 1;
  padding: 20px;
  background-color: var(--dark-background-color);
  color: #f2f3f5;
  padding: 5% 10%;

  overflow-y: auto;
}

footer {
  display: flex;
  background-color: var(--dark-background-color);
  padding: 20px 10%;
  height: 100px;
  width: 100%;
  align-items: center;
  justify-content: center;
  color: #f2f3f5;

  flex-shrink: 0;

  display: none;
}

#profile > img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
}