* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  text-align: center;
  font-family: Arial;
  background: #222;
  color: white;
}

#main {
  display: flex;
  flex-direction: column;
  height: 100%;
  max-width: 800px;
  margin: 0 auto;
}
#content {
  display: flex;
  flex-grow: 1;
  flex-direction: column;
  justify-content: space-around;
  padding: 20px 0;
}

#logo {
  width: 120px;
}

label {
  display: block;
  margin-bottom: 10px;
  font-size: 20px;
}

textarea,
button {
  border-radius: 4px;
  box-shadow: 0 4px 4px rgba(0, 0, 0, 0.2);
  outline: none;
}

textarea {
  display: block;
  width: 100%;
  height: 100px;
  padding: 10px;
  resize: none;
  background: #333;
  border: 1px solid #555;
  color: #eee;
  overflow: hidden;
  transition: border-color 0.2s;
}
textarea:focus {
  border-color: #42a5f5;
}

button {
  padding: 10px 20px;
  background: #1e88e5;
  border: none;
  color: white;
  font-size: 20px;
  transition: background 0.2s;
  cursor: pointer;
}
button:hover,
button:focus {
  background: #1976d2;
}