1. Create a new source\css\twikoo.css file and add the following code:

     1/* Set text content :nth-child(1) selects the first element */
     2.el-input.el-input--small.el-input-group.el-input-group--prepend:nth-child(1):before {
     3  content: "Entering your QQ number will automatically fetch your nickname and avatar🐧";
     4}
     5
     6.el-input.el-input--small.el-input-group.el-input-group--prepend:nth-child(2):before {
     7  content: "Replies will be sent to your email📧";
     8}
     9
    10.el-input.el-input--small.el-input-group.el-input-group--prepend:nth-child(3):before {
    11  content: "You can access your website via your nickname🔗";
    12}
    13
    14/* Display when the user clicks on the input field */
    15.el-input.el-input--small.el-input-group.el-input-group--prepend:focus-within::before,
    16.el-input.el-input--small.el-input-group.el-input-group--prepend:focus-within::after {
    17  display: block;
    18}
    19
    20/* Main content area */
    21.el-input.el-input--small.el-input-group.el-input-group--prepend::before {
    22  /* Hide initially */
    23  display: none;
    24  /* Absolute positioning */
    25  position: absolute;
    26  /* Move up by 60 pixels */
    27  top: -60px;
    28  /* Prevent text wrapping caused by left:50% */
    29  white-space: nowrap;
    30  /* Rounded corners */
    31  border-radius: 10px;
    32  /* 50% from the left */
    33  left: 50%;
    34  /* Move left by half of its own width to center it */
    35  transform: translate(-50%);
    36  /* Padding */
    37  padding: 14px 18px;
    38  background: #444;
    39  color: #fff;
    40}
    41
    42/* Small arrow indicator */
    43.el-input.el-input--small.el-input-group.el-input-group--prepend::after {
    44  display: none;
    45  content: "";
    46  position: absolute;
    47  /* When the content size (width and height) is 0 and the border size is not 0, each border (4 borders) becomes a triangle, forming a square.
    48     First, make all borders transparent, then add color to one border to create a small triangle */
    49  border: 12px solid transparent;
    50  border-top-color: #444;
    51  left: 50%;
    52  transform: translate(-50%, -48px);
    53}
    54
    55/************ Adjust the background box style in Twikoo comments ************/
    56#twikoo .tk-content {
    57  background: rgb(235 235 235 / 60%);
    58  padding: 10px 15px;
    59  border-radius: 10px;
    60}
    61
    62.tk-content * {
    63  margin: 0;
    64}
    65/************ Adjust the background box style in Twikoo comments ************/
    66
    67/* Style for the expand/collapse button */
    68.tk-expand {
    69  background: var(--card-bg);
    70  border: 1px solid #e0e3ed;
    71  box-shadow: 0 5px 10px rgb(189 189 189 / 10%);
    72  transition: all 0.3s ease-in-out;
    73  border-radius: 12px;
    74}
    
  2. Introduce the css file in the head section of the _config.butterfly.yml theme configuration file:

    1<link rel="stylesheet" href="/css/twikoo.css"> # Bubble styling for Twikoo comments
    
  3. Redeploy using hexo clean && hexo g && hexo s.