样式 Styles（行间距、字间距、背景色、文字颜色、文字字体、文字对齐、文字大小等）
Setting the style of an HTML element, can be done with the style attribute.
The HTML style attribute has the following syntax:
<tagname style="property:value;">
The property is a CSS property. The value is a CSS value.
HTML Background Color
The background-color property defines the background color for an HTML element.
This example sets the background color for a page to powderblue.
<body style="background-color:powderblue;">
<h1>This is a heading</h1>
<p>This is a paragraph.</p>
</body>
HTML Text Color
The color property defines the text color for an HTML element:
<h1 style="color:blue;">This is a heading</h1>
<p style="color:red;">This is a paragraph.</p>
HTML Fonts
The font-family property defines the font to be used for an HTML element:
<h1 style="font-family:verdana;">This is a heading</h1>
<p style="font-family:courier;">This is a paragraph.</p>
HTML Text Size
The font-size property defines the text size for an HTML element:
<h1 style="font-size:300%;">This is a heading</h1>
<p style="font-size:160%;">This is a paragraph.</p>
<!DOCTYPE html>
<html>
<head>
<style>
h1 {
color: blue;
font-family: verdana;
font-size: 300%;
}
p {
color: red;
font-family: courier;
font-size: 160%;
}
</style>
</head>
<body>
<h1>This is a heading</h1>
<p>This is a paragraph.</p>
</body>
</html>
HTML Text Alignment
The text-align property defines the horizontal text alignment for an HTML element:
<h1 style="text-align:center;">Centered Heading</h1>
<p style="text-align:center;">Centered paragraph.</p>
CSS Border
The CSS border property defines a border around an HTML element:
p {
border: 1px solid powderblue;
}
CSS Padding
The CSS padding property defines a padding (space) between the text and the border:
p {
border: 1px solid powderblue;
padding: 30px;
}
CSS Margin
The CSS margin property defines a margin (space) outside the border:
p {
border: 1px solid powderblue;
margin: 50px;
}
The id Attribute
To define a specific style for one special element, add an id attribute to the element:
<p id="p01">I am different</p>
then define a style for the element with the specific id:
#p01 {
color: blue;
}
<!DOCTYPE html>
<html>
<head>
<style>
#p01 {
color: blue;
}
</style>
</head>
<body>
<p>This is a paragraph.</p>
<p>This is a paragraph.</p>
<p id="p01">I am different.</p>
</body>
</html>
Note: The id of an element should be unique within a page, so the id selector is used to select one unique element!
The class Attribute
To define a style for a special type of elements, add a class attribute to the element:
<p class="error">I am different</p>
then define a style for the elements with the specific class:
p.error {
color: red;
}
<!DOCTYPE html>
<html>
<head>
<style>
p.error {
color: red;
}
</style>
</head>
<body>
<p>This is a paragraph.</p>
<p>This is a paragraph.</p>
<p class="error">I am different.</p>
<p>This is a paragraph.</p>
<p class="error">I am different too.</p>
</body>
</html>
Summary
-
Use the
styleattribute for styling HTML elements -
Use
background-colorfor background color -
Use
colorfor text colors -
Use
font-familyfor text fonts -
Use
font-sizefor text sizes -
Use
text-alignfor text alignment -
Use the CSS
borderproperty for borders -
Use the CSS
paddingproperty for space inside the border -
Use the CSS
marginproperty for space outside the border -
The
idAttribute -
The
classAttribute
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