:root {
  --save-color: #007bff;
  --edit-color: #28a745;
  --delete-color: #dc3545;
  --back-color: #6c757d;
}

body {
  font-family: Arial, sans-serif;
  background-color: #f0f0f0;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background-color: #fff;
  padding: 20px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  width: 300px;
}

header {
  text-align: center;
  margin-bottom: 20px;
}

header h1 {
  font-size: 24px;
  margin: 0;
}

nav {
  margin-bottom: 20px;
  text-align: center;
}

nav a {
  margin: 0 10px;
  text-decoration: none;
  color: var(--save-color);
}

nav a:hover {
  text-decoration: underline;
}

form {
  display: flex;
  flex-direction: column;
}

form label {
  margin-bottom: 5px;
}

form input[type="text"],
form textarea {
  margin-bottom: 10px;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
}

.button {
  padding: 10px;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  display: inline-block;
  width: 100%;
}

.button:hover {
  opacity: 0.9;
}

.button.save {
  background-color: var(--save-color);
}

.button.delete {
  background-color: var(--delete-color);
  padding: 12px;
  font-size: 90%;
}

.button.edit {
  background-color: var(--edit-color);
}

.button.back {
  background-color: var(--back-color);
  margin-top: 10px;
  display: block;
  margin: 10px auto 0;
  box-sizing: border-box;
}

.memo-list {
  list-style: none;
  padding: 0;
}

.memo-list li {
  margin-bottom: 10px;
}

.memo-list a {
  text-decoration: none;
  color: var(--save-color);
}

.memo-list a:hover {
  text-decoration: underline;
}

.memo-actions {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
}

.memo-actions form,
.memo-actions a {
  flex: 1;
  margin: 0 5px;
}

.memo-actions form:first-child,
.memo-actions a:first-child {
  margin-left: 0;
}

.memo-actions form:last-child,
.memo-actions a:last-child {
  margin-right: 0;
}