按钮背景从左至右渐变

.btn {
    background: linear-gradient(to right, #ff7e5f, #feb47b);
    background-size: cover;
    border-radius: 100px;
    border: none;
    color: white;
    font-size: 16px;
    padding: 10px 20px;
    cursor: pointer;
    outline: none;
  }