* { box-sizing: border-box; }

body {
  font-family: 'Helvetica Neue', sans-serif;
  background-color: #f3e5f5;
  color: #4a148c;
  padding: 15px;
}

header {
  background-color: #6a1b9a;
  color: white;
  padding: 10px 15px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}

header nav a {
  color: white;
  padding: 6px 10px;
  text-decoration: none;
  background-color: #8e24aa;
  border-radius: 4px;
}

header nav a:hover {
  background-color: #6a1b9a;
}

table {
  width: 100%;
  background-color: white;
  border: 1px solid #ce93d8;
  border-collapse: collapse;
  margin-top: 15px;
}

thead {
  background-color: #e1bee7;
  color: #4a148c;
}

th, td {
  border: 1px solid #ce93d8;
  padding: 10px;
}

tr.paid {
  background-color: #c8e6c9;
}

a.button, .button {
  background-color: #7b1fa2;
  color: white;
  padding: 6px 12px;
  border-radius: 4px;
  text-decoration: none;
}

a.button:hover {
  background-color: #4a0072;
}

footer {
  margin-top: 30px;
  font-size: 12px;
  color: #6a1b9a;
  text-align: center;
}