style.css

header, main {
  width: 50vw;
  margin: auto;
}

header h1 { 
  display: inline;
}

header a {
  float: right;
  margin-top: 15px;
}

header h3 {
  color: gray;
}

header a, main a {
  color: blue;
  text-decoration: none;
}

header a:hover, main a:hover {
  color: darkblue;
  text-decoration: underline;
}

article {
  border-bottom: 1px solid lightgrey;
}

article h3 {
  display: inline-block;
  margin-bottom: 10px;
}

article h3.date, article h3.action {
  float: right;
  color: gray;
}

article h3.action a {
  color: gray;
}

article h3.action a.edit {
  margin-right: 20px;
}

article h3.title a {
  color: black;
  text-decoration: none;
}

article h3.title a:hover {
  color: blue;
  text-decoration: underline;
}

form {
  margin: 20px 0;
}

input, textarea {
  margin: 5px 0;
  padding: 10px;
  width: 100%;
  border: 2px solid black;
  border-radius: 10px;
  font-size: 18px;
  box-sizing: border-box;
}

form button {
  width: 100px;
  height: 40px;
  margin-top: 10px;
  font-size: 14px;
  font-weight: bold;
}

form button:hover {
  cursor: pointer;
}

p.error {
  color: red;
  font-size: small;
  margin: 0 0 10px 5px;
}

p.success {
  color: green;
}