.break-line {
  height: 20px;
  padding: 10px 0;
}

.title {
  color: red;
  font-size: 24px;
}

p {
  white-space: pre-wrap;
}

header, nav {
  text-align: center;
  background: white;
  margin: 20px 0;
  padding: 10px;
}

nav a {
  text-decoration: none;
  background: #333;
  border-radius: 5px;
  color: white;
  padding: 3px 8px;
}

.center {
  margin: 0 auto;
  width: 200px;
  background: black;
  padding: 20px;
  color: white;
}

.inline-block-center div {
  background: black;
  color: white;
  padding: 15px;
  width: 150px;
}

.inline-block-center {
  margin: 10px 0;
  text-align: center;
}

.inline-block-center div {
  display: inline-block;
}

.flex-center {
  display: flex;
  justify-content: center;
}

.text-align-center {
  height: 50px;
  margin: 20px;
  text-align: center;
}

.text-align-center a {
  background: black;
  color: white;
  padding: 25px 10px;
  text-decoration: none;
  line-height: 50px;
}

.text-align-center-1 {
  background: beige;
  text-align: center;
}

.text-align-center-1 a {
  color: red;
  text-decoration: none;
  padding: 0 10px;
  height: 50px;
  line-height: 50px;
}

.flex-center {
  height: 500px;
  width: 60%;
  background-color: aquamarine;
  margin: 0 auto;
}

.flex-container {
  display: flex;
  justify-content: center;
  flex-direction: column;
}

.flex-container div {
  margin: 10px;
  width: 200px;
  background-color: black;
  color: white;
  padding: 15px;
}

.absolute-parent {
  position: relative;
  background-color: #ffcf22;
  height: 200px;
}

.absolute-child-no-height {
  position: absolute;
  background-color: greenyellow;
  top: 50%;
  left: 50%;
  text-align: center;
  transform: translate(-50%, -50%);
}

.absolute-child-with-height {
  position: absolute;
  background-color: greenyellow;
  text-align: center;
  top: 50%;
  left: 50%;
  height: 100px;
  width: 100px;
  margin-left: -50px;
  margin-top: -50px;
}

.absolute-parent-flex {
  display: flex;
  background-color: #ffcf22;
  height: 200px;
  justify-content: center;
  align-items: center;
}

.absolute-child-flex {
  height: 100px;
  background-color: greenyellow;
}

.absolute-center {
  position: relative;
  width: 100%;
  height: 300px;
  background-color: darksalmon;
}

.absolute-center-child {
  position: absolute;
  margin: auto;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  width: 50%;
  height: 50%;
  background-color: powderblue;
}