Summary  
This chapter explains the CSS box model, showing how to control element spacing with padding and margin, define borders (including shorthand versus individual side properties), and apply different border styles.

General domain of usage  
Front-end web development

You know that every element has content, padding, border, and margin. Let's see how to control spacing using those properties.

## Padding
Padding creates space **inside** the element, between the content and the border.
```css
.box {
  padding: 20px;
}
```
This applies 20px of padding on all four sides.

### Padding Shorthand
Padding can be written using shorthand syntax.

The order of values is always: top → right → bottom → left

```css
padding: 20px; /* all sides */
padding: 10px 20px; /* top/bottom | left/right */
padding: 10px 20px 5px; /* top | left/right | bottom */
padding: 10px 15px 20px 25px; /* top | right | bottom | left */
```

### Individual Padding Properties

You can also control each side separately:
```css
padding-top: 10px;
padding-right: 15px;
padding-bottom: 25px;
padding-left: 5px;
```

## Margin
Margin creates space **outside** the element, between it and other elements.
```css
.box {
  margin: 20px;
}
```



### Margin Shorthand
Margin follows the same shorthand rules as padding:

```css
margin: 20px; /* all sides */
margin: 10px 20px; /* top/bottom | left/right */
margin: 10px 20px 5px; /* top | left/right | bottom */
margin: 10px 15px 20px 25px; /* top | right | bottom | left */
```

### Individual Margin Properties
Can also be set individually:
```css
margin-top: 10px;
margin-right: 15px;
margin-bottom: 25px;
margin-left: 5px;
```


## Border
The border sits **between** padding and margin.

Basic shorthand:
```css
border: 4px solid brown;
```
This defines: width, style, color.

Common border styles include `solid`, `dotted`, `dashed`, and `double`.

You can also control individual sides if needed:
```css
border-top: 2px solid black;
```

Let's consider the following example and figure out the possible border styles:



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<!DOCTYPE html>
<html lang="en">
  <head>
    <style>
      /* Current focus */
      .box-one {
        border: 2px solid brown;
      }

      .box-two {
        border: 2px dotted brown;
      }

      .box-three {
        border: 2px dashed brown;
      }

      .box-four {
        border: 4px double brown;
      }

      /* Additional styles for better appearance (not the current focus) */
      .border-showcase {
        display: flex;
        flex-wrap: wrap;
        gap: 30px;
        justify-content: center;
        max-width: 600px;
margin: auto;
      }

      .card {
        width: 200px;
        padding: 20px;
        border-radius: 12px;
        background-color: white;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
        text-align: center;
        transition: transform 0.2s ease;
      }

      h3 {
        margin-top: 0;
        font-size: 18px;
        color: #333;
      }

      p {
        font-size: 14px;
        color: #555;
        line-height: 1.5;
      }
    </style>
  </head>
  <body>
    <div class="border-showcase">
      <div class="card box-one">
        <h3>Solid Border</h3>
        <p>A classic, clean solid line used in most UI elements.</p>
      </div>

      <div class="card box-two">
        <h3>Dotted Border</h3>
        <p>Used for outlines, notes, or decorative elements.</p>
      </div>

      <div class="card box-three">
        <h3>Dashed Border</h3>
        <p>Often seen in editable fields or "drag here" zones.</p>
      </div>

      <div class="card box-four">
        <h3>Double Border</h3>
        <p>Stylish and bold - used for emphasis or framing.</p>
      </div>
    </div>
  </body>
</html>


Padding:
- Adds space inside the element;
- Expands the background area.

Margin:
- Adds space outside the element;
- Does not affect the element's background.

Key Difference

Which side receives `40px` in the following declaration?

Which property adds space inside an element, between its content and border?

Beherrschen Sie die Grundlagen von CSS, der Gestaltungssprache, die das Erscheinungsbild von Webseiten verändert. Erforschen Sie zentrale Konzepte wie Textstile, Farben, Abstände, das Box-Modell, Flexbox und dekorative Effekte. Entwickeln Sie die Fähigkeiten, um optisch ansprechende und gut strukturierte Webseiten zu erstellen.

Verstehen, wie CSS mit HTML verbunden wird und wie Stile durch Selektoren angewendet werden. Farben, Textgestaltung und Hover-Effekte zur Steuerung der visuellen Darstellung anwenden.

Verbesserung der Typografie durch Zeilenhöhe, Abstände, Schriftarteigenschaften und benutzerdefinierte Schriftarten. Steuerung von Schriftfamilien, -gewicht, -stil und -größe für eine bessere Lesbarkeit.

Steuerung der Layoutstruktur mit Margin-, Padding-, Border- und Width-Eigenschaften. Verständnis des Box-Sizing-Verhaltens und der Anzeigearten von Elementen wie Block, Inline und Inline-Block.

Steuerung von horizontalen und vertikalen Layouts mit Flexbox-Eigenschaften. Anpassung von Richtung, Ausrichtung und Abstand zur Strukturierung von UI-Komponenten.

Layouts mit Hintergrundfarben, Bildern, Pseudoelementen und Schatten aufwerten. Visuelle Komponenten für Tiefe und Kontrast gestalten.

Margin and Padding Made Simple

Padding

Padding Shorthand

Individual Padding Properties

Margin

Margin Shorthand

Individual Margin Properties

Border

Output

1. Which side receives `40px` in the following declaration?

2. Which property adds space inside an element, between its content and border?