rennsyuu3--2.21.css

body {
  font-family: Arial, sans-serif;
}

#header {
  background-color: #ff6600;
  color: #fff;
  padding: 10px;
  text-align: center;
}

#messages {
  padding: 10px;
}

#message-list {
  list-style-type: none;
  margin: 0;
  padding: 0;
}

#message-list li {
  background-color: #f1f1f1;
  border: 1px solid #ddd;
  margin-bottom: 10px;
  padding: 10px;
}

#form {
  padding: 10px;
  background-color: #f9f9f9;
  border-top: 1px solid #ddd;
}

#message-input {
  width: 80%;
  padding: 12px 20px;
  margin: 8px 0;
  box-sizing: border-box;
  border: 2px solid #ccc;
  border-radius: 4px;
  background-color: #fff;
  font-size: 16px;
  resize: none;
}

button[type="submit"] {
  background-color: #ff6600;
  color: #fff;
  padding: 12px 20px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  float: right;
}

button[type="submit"]:hover {
  background-color: #ff8533;
}