body {
  background:#f5f6f7;
  color:#333;
  font-family:sans-serif;
  margin:0;
}

#nav {
  align-items:center;
  background:#222;
  color:#fff;
  display:flex;
  gap:20px;
  height:3em;
  left:0;
  padding:0 20px;
  position:absolute;
  right:0;
  top:0;
}

#nav a {
  color:#fff;
  text-decoration:none;
}

#nav a.active {
  text-decoration:underline;
}

#content {
  padding:4em 2em 2em 2em;
}

textarea {
  box-sizing: border-box;
  font-size:14pt;
  height:120px;
  width:100%;
}

pre {
  background:#f0f0f0;
  max-width:100%;
  padding:15px;
  white-space:pre-wrap;
  word-wrap:break-word;
}

button {
  background:#1877f2;
  border-radius:5px;
  border:none;
  color:white;
  cursor:pointer;
  margin-top:20px;
  padding:10px 20px;
}

button:hover {
  background:#145dbf;
}

h1 {
  color:#1877f2;
}

label {
  display:block;
  margin:10px 0 5px;
}

input {
  font-size:1rem;
  max-width:200px;
  padding:5px;
  width:100%;
}

input:invalid {
  border:2px solid red;
}

.results {
  background:white;
  border-radius:8px;
  box-shadow:0 0 5px rgba(0,0,0,0.1);
  margin-top:20px;
  padding:15px;
}

@media(max-width:810px){
  #content {
    padding:4em 1em 1em 1em;
  }
}