CSS MASTER CLASS /// VISUAL ENGINEERING /// LAYOUT DESIGN /// ANIMATION LAB /// CSS MASTER CLASS /// VISUAL ENGINEERING ///

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Pascual Vila

Frontend Instructor // Code Syllabus

Common Pitfalls & Errors

The Error //

Misunderstanding Box Sizing

/* Wrong (Element might overflow container) */
.box {
  width: 100%;
  padding: 20px;
}

/* Correct */
.box {
  box-sizing: border-box;
  width: 100%;
  padding: 20px;
}

The Solution //

By default, width and height only apply to the content box. Add 'box-sizing: border-box;' so padding and borders are included in the element's total width and height.

The Error //

Specificity Wars

/* Wrong */
#container .list-item.active { color: red !important; }

/* Correct */
.list-item-active { color: red; }

The Solution //

Avoid using !important or overly complex selectors (like div#main span.active). Keep your selectors as flat and simple as possible to make them easier to override.