As a new online merchant, do you want to personalize your Shopify store’s look and feel beyond the limitations of your current theme? In this article, we will instruct you on how to insert CSS code into your Shopify stylesheet, unlocking a world of customization possibilities. 

After reading the post, you can master how to refine your store’s design, enhance its visual appeal, and create a truly unique brand experience by mastering this essential technique.

How to insert CSS to your stylesheet

• Step 1: Select the Assets folder
• Step 2: Find files with the .css.liquid extension
• Step 3: Copy and paste the CSS into your files

Step 1: Select the Assets folder

Firstly, you need to open the Edit HTML/CSS page and then find the folder named Assets. Finally, select the Assets folder and all the content in that folder will be shown to you.

Step 2: Find files with the .css.liquid extension

After opening the folder, you need to find all the files with the .css.liquid extension except for the file with the checkout.css.liquid extension. Please kindly note that there should be only one other file with that extension. The other file can be the file that has one of these following names: styles.css.liquid, style.css.liquid or shop.css.liquid.

Step 3: Copy and paste the CSS into your files

As soon as you have found the file in step 2, you need to open it with the online code editor. Once the file is opened, you only need to copy this following CSS at the bottom of that file. Please remember that the CSS must be at the bottom of your stylesheet. Here is the CSS:

<div class="language-plaintext highlighter-rouge">
<div class="highlight">
<pre class="highlight"><code>

/* 
   Swatches Styles
*/

{% assign width = '50px' %}
{% assign height = '35px' %}
.swatch { 
  margin:1em 0; 
}
/* Label */
.swatch .header {
  margin: 0.5em 0;
}
/* Hide radio buttons.*/
.swatch input { 
  display:none;
}
.swatch label {
  /* Rounded corners */
  -webkit-border-radius:2px;
  -moz-border-radius:2px;
  border-radius:2px;
  /* To give width and height */
  float:left;
  /* Color swatches contain no text so they need to have a width. */
  min-width:{{ width }} !important; 
  height:{{ height }} !important;
  /* No extra spacing between them */
  margin:0;
  /* The border when the button is not selected */
  border:#ccc 1px solid;
  /* Background color */
  background-color:#ddd;
  /* Styling text */
  font-size:13px;
  text-align:center;
  line-height:{{ height }};
  white-space:nowrap;
  text-transform:uppercase;
}
.swatch-element label { padding:0 10px; }
.color.swatch-element label { padding:0; }
/* Styling selected swatch */
/* Slightly raised */
.swatch input:checked + label {
  -webkit-box-shadow:0px 1px 2px rgba(0,0,0,0.8);
  -moz-box-shadow:0px 1px 2px rgba(0,0,0,0.8);
  box-shadow:0px 1px 2px rgba(0,0,0,0.8);
  border-color:transparent;
} 
.swatch .swatch-element {
  float:left;
  -webkit-transform:translateZ(0); /* webkit flicker fix */
  -webkit-font-smoothing:antialiased; /* webkit text rendering fix */
  /* Spacing between buttons */
  margin:0px 10px 10px 0;
  /* To position the sold out graphic and tooltip */
  position:relative;
}
/* Image with the cross in it */
.crossed-out { position:absolute; width:100%; height:100%; left:0; top:0; }
.swatch .swatch-element .crossed-out { display:none; }
.swatch .swatch-element.soldout .crossed-out { display:block; }
.swatch .swatch-element.soldout label {
  filter: alpha(opacity=60); /* internet explorer */
  -khtml-opacity: 0.6;      /* khtml, old safari */
  -moz-opacity: 0.6;       /* mozilla, netscape */
  opacity: 0.6;           /* fx, safari, opera */
}
/* Tooltips */
.swatch .tooltip {
  text-align:center;
  background:gray;
  color:#fff;
  bottom:100%;
  padding: 10px;
  display:block;
  position:absolute;
  width:100px;
  left:{{ width | remove: 'px' | to_number | divided_by: 2 | minus: 50 | plus: 2 }}px;
  margin-bottom:15px;
  /* Make it invisible by default */
  filter:alpha(opacity=0);
  -khtml-opacity: 0;
  -moz-opacity: 0;
  opacity:0;
  visibility:hidden;
  /* Animations */
  -webkit-transform: translateY(10px);
     -moz-transform: translateY(10px);
      -ms-transform: translateY(10px);
       -o-transform: translateY(10px);
          transform: translateY(10px);
  -webkit-transition: all .25s ease-out;
     -moz-transition: all .25s ease-out;
      -ms-transition: all .25s ease-out;
       -o-transition: all .25s ease-out;
          transition: all .25s ease-out;
  -webkit-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
     -moz-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
      -ms-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
       -o-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
          box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
  z-index: 10000;
  -moz-box-sizing:border-box; 
  -webkit-box-sizing:border-box; 
  box-sizing:border-box;
}
.swatch .tooltip:before {
  bottom:-20px;
  content:" ";
  display:block;
  height:20px;
  left:0;
  position:absolute;
  width:100%;
}
/* CSS triangle */
.swatch .tooltip:after {
  border-left:solid transparent 10px;
  border-right:solid transparent 10px;
  border-top:solid gray 10px;
  bottom:-10px;
  content:" ";
  height:0;
  left:50%;
  margin-left:-13px;
  position:absolute;
  width:0;
}
.swatch .swatch-element:hover .tooltip {
  filter:alpha(opacity=100);
  -khtml-opacity:1;
  -moz-opacity:1;
  opacity:1;
  visibility:visible;
  -webkit-transform:translateY(0px);
     -moz-transform:translateY(0px);
      -ms-transform:translateY(0px);
       -o-transform:translateY(0px);
          transform:translateY(0px);
}
.swatch.error {
  background-color:#E8D2D2!important;
  color:#333!important;
  padding:1em;
  border-radius:5px;
}
.swatch.error p {
  margin:0.7em 0;
}
.swatch.error p:first-child {
  margin-top:0;
}
.swatch.error p:last-child {
  margin-bottom:0;
}
.swatch.error code {
  font-family:monospace;
}


</code></pre>
</div>
</div>

If you have problems of not being able to find the theme’s stylesheet, you need to copy and paste the CSS above into a style element. Once you are done, please do not forget to insert that style element at the bottom of the product.liquid file.

Conclusion

You have just explored the detailed guide to inserting CSS code into your Shopify stylesheet, enabling you to customize your store’s appearance and enhance its visual appeal. To maintain a clean and organized codebase, consider using comments to document your CSS additions and regularly back up your theme files to prevent accidental data loss.