main.css

/* Light theme */
body {
  background-color: #F2F2F2;
  color: #333333;
  font-family: Arial, sans-serif;
}

#container {
  width: 550px;
  margin: 50px auto;
  background-color: #FFFFFF;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 0 10px #BBBBBB;
}

h1 {
  text-align: center;
  margin-bottom: 30px;
}

#tool-list {
  text-align: center;
  margin-top: 30px;
}

a {
  display: block;
  margin-bottom: 20px;
  padding: 10px;
  background-color: #007FFF;
  color: #FFFFFF;
  border-radius: 5px;
  text-decoration: none;
  font-size: 16px;
  cursor: pointer;
}

a:hover {
  background-color: #0060BF;
}

#theme-switch-button {
  position: absolute;
  top: 20px;
  right: 20px;
  background-color: #007FFF;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

#theme-switch-button i {
  color: #FFFFFF;
  font-size: 20px;
}

/* Dark theme */
.dark-theme {
  background-color: #333333;
}
.dark-theme body {
  background-color: #333333;
  color: #F2F2F2;
}

.dark-theme #container {
  color: #F2F2F2;
  background-color: #444444;
  box-shadow: 0 0 10px #222222;
}

.dark-theme a {
  background-color: #0060BF;
}

.dark-theme a:hover {
  background-color: #007FFF;
}

.dark-theme #theme-switch-button {
  background-color: #0060BF;
}

.dark-theme #theme-switch-button i {
  color: #F2F2F2;
}