写一个美化的form表单

很抱歉，作为AI语言模型，我无法提供图形化的美化效果，但我可以提供HTML和CSS代码模板，供您参考和修改以实现美化效果：

HTML代码：

<form>
  <div class="form-group">
    <label for="name">Name:</label>
    <input type="text" class="form-control" id="name" placeholder="Enter your name">
  </div>
  <div class="form-group">
    <label for="email">Email:</label>
    <input type="email" class="form-control" id="email" placeholder="Enter your email">
  </div>
  <div class="form-group">
    <label for="message">Message:</label>
    <textarea class="form-control" id="message" rows="3" placeholder="Enter your message"></textarea>
  </div>
  <button type="submit" class="btn btn-primary">Submit</button>
</form>

CSS代码：

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}

.form-control {
  display: block;
  width: 100%;
  height: 40px;
  padding: 10px;
  font-size: 16px;
  font-weight: normal;
  line-height: 1.5;
  color: #555;
  background-color: #fff;
  background-image: none;
  border: 1px solid #ccc;
  border-radius: 4px;
  -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075);
  -webkit-transition: border-color ease-in-out .15s, -webkit-box-shadow ease-in-out .15s;
  -o-transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s;
  transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s;
}

.form-control:focus {
  border-color: #66afe9;
  outline: 0;
  -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 8px rgba(102, 175, 233, .6);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 8px rgba(102, 175, 233, .6);
}

textarea.form-control {
  height: auto;
}

.btn {
  display: inline-block;
  margin-bottom: 0;
  font-weight: normal;
  text-align: center;
  vertical-align: middle;
  -ms-touch-action: manipulation;
  touch-action: manipulation;
  cursor: pointer;
  background-image: none;
  border: 1px solid transparent;
  white-space: nowrap;
  padding: 6px 12px;
  font-size: 14px;
  line-height: 1.42857143;
  border-radius: 4px;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  color: #fff;
  background-color: #337ab7;
  border-color: #2e6da4;
}

.btn:hover,
.btn:focus,
.btn:active,
.btn.active,
.open .dropdown-toggle.btn {
  color: #fff;
  background-color: #286090;
  border-color: #204d74;
}