Here's how the installation:
Note: Remove the CSS code for the label in the template.
First you should add a label widget in blog
Go to Blogger> Layout> Add Gadget> Then add the widget label and follow the settings according to the image below
Then Save.
Next, go to Template> Edit HTML> Then paste the CSS code below just above]]> </ b: skin> or </ style>
.sidebar .label-size { position:relative; text-transform:uppercase; text-decoration:none; font-size:13px; font-family:Arial; color:#fff!important; } .sidebar .label-size a { color:#fff!important; font-weight:bold; padding:8px 10px; margin:0 6px 6px 0; float:left; display:block; transition: all 0.4s ease-in-out; } .sidebar .label-size-1 a {background:#1abc9c;border-bottom:3px solid #127F69;} .sidebar .label-size-1 a:hover {background:#16a085;} .sidebar .label-size-2 a {background:#3498db;border-bottom:3px solid #226693;} .sidebar .label-size-2 a:hover {background:#2980b9;} .sidebar .label-size-3 a {background:#2ecc71;border-bottom:3px solid #1F8C4C;} .sidebar .label-size-3 a:hover {background:#27ae60} .sidebar .label-size-4 a {background:#9b59b6;border-bottom:3px solid #74398E;} .sidebar .label-size-4 a:hover {background:#8e44ad} .sidebar .label-size-5 a {background:#e74c3c;border-bottom:3px solid #922C20;} .sidebar .label-size-5 a:hover {background:#c0392b}
Save Template and see the final results. Quite so and hopefully useful.