/* 基本样式 */
.url-item {
  color: black;
  font-size: 16px;
}

/* 针对桌面端浏览器的样式 */
@media (min-width: 768px) {
  .url-item {
    color: blue;
  }
}

/* 针对移动端浏览器的样式 */
@media (max-width: 767px) {
  .url-item {
    color: red;
  }
}
body {
  font-family: Arial, sans-serif;
       margin-left: auto;
     margin-right: auto;
}

h1, th, td {
  text-align: left;
}

table {
  width: 100%;
  border-collapse: collapse;
}

table, th, td {
  border: 1px solid black;
  padding: 15px;
}

th {
  background-color: #4CAF50;
  color: white;
}

a {
  color: #007bff;
}

a:hover {
  color: #0056b3;
  text-decoration: none;
}

.add-button {
  display: block;
  width: 200px;
  height: 50px;
  background-color: #4CAF50;
  color: white;
  text-align: center;
  line-height: 50px;
  margin: 0 auto;
  margin-top: 20px;
  border: none;
  cursor: pointer;
}

.add-button:hover {
  background-color: #45a049;
}
.url-list {
    display: flex;
    flex-wrap: wrap;
}

.url-item {
    width: 150px;
    height: 50px;
}
a {
  text-decoration: none;
}