How can I apply styles to multiple classes at once?

Related Posts:

1. Is there a CSS parent selector?
2. Nesting CSS classes
3. What is the difference between the selectors “.class.class” and “.class .class”?
4. In CSS what is the difference between “.” and “#” when declaring a set of styles? [duplicate]
5. What does “*” mean in CSS?
6. What does an asterisk (*) do in a CSS selector?
7. Is there an opposite CSS pseudo-class to :hover?
8. Combine :after with :hover
9. What does the “~” (tilde/squiggle/twiddle) CSS selector mean?
10. Is there a “previous sibling” selector?
11. Specify multiple attribute selectors in CSS
12. CSS “and” and “or”
13. CSS selector for first element with class
14. How to select label for=”XYZ” in CSS?
15. What’s the difference between SCSS and Sass?
16. How am I supposed to use index.html?
17. Column order manipulation using col-lg-push and col-lg-pull in Twitter Bootstrap 3
18. What is the difference among col-lg-*, col-md-* and col-sm-* in Bootstrap?
19. Adding border to SVG image
20. What does !important mean in CSS?
21. Set line spacing
22. Remove blue underline from link
23. CSS Background Opacity [duplicate]
24. Outline effect to text
25. Customize Bootstrap checkboxes
26. Making a that’s a link in HTML
27. React.js inline style best practices [closed]
28. What is a user agent stylesheet?
29. What is a user agent stylesheet?
30. CSS to make HTML page footer stay at bottom of the page with a minimum height, but not overlap the page
31. Vertically align text within a div
32. How to align a
    to the middle (horizontally/width) of the page [duplicate]
33. Animate the overflow property
34. Set parent style via child
35. Is there a color code for transparent in HTML?
36. multiple classes on single element html
37. CSS opacity only to background color, not the text on it?
38. How do I center floated elements?
39. create a white rgba / CSS3
40. Using CSS for a fade-in effect on page load
41. Gradient borders
42. Superscript in CSS only?
43. What is WebKit and how is it related to CSS?
44. What’s the difference between display:inline-flex and display:flex?
45. Making an iframe responsive
46. How can I invert color using CSS?
47. How to insert spaces/tabs in text using HTML/CSS
48. font-family is inherit. How to find out the font-family in chrome developer pane?
49. How to get these two divs side-by-side?
50. How can I vertically center a “div” element for all browsers using CSS?
51. What does auto do in margin: 0 auto?
52. Does bootstrap have builtin padding and margin classes?
53. not:first-child selector
54. How to change the color of an svg element?
55. Changing spacing between paragraphs and inside of paragraphs
56. Is there a color code for transparent in HTML?
57. How to vertically align an image inside a div
58. How can I center an absolutely positioned element in a div?
59. Applying Comic Sans Ms font style
60. How to set up fixed width for ?
61. “Stray start tag footer” in html validator?
62. How to change btn color in Bootstrap
63. Make div scrollable
64. Failed to decode downloaded font, OTS parsing error: invalid version tag + rails 4
65. Chrome give error **Failed to load resource: net::ERR_NAME_NOT_RESOLVED** while other browser load images
66. CSS: Creating textured backgrounds
67. Insert image after each list item
68. How to make the HTML link activated by clicking on the
69. ?
70. How to change text transparency in HTML/CSS?
71. How do I hide the bullets on my list for the sidebar?
72. limitations of using @Html.EditorForModel
73. Transition of background-color
74. How to implement max-font-size?
75. How to float 3 divs side by side using CSS?
76. How to override the properties of a CSS class using another CSS class
77. HTML Width Percentage
78. Circle button css
79. How to use css first-child with :not()
80. force footer on bottom on pages with little content
81. draw diagonal lines in div background with CSS
82. How to add a color overlay to a background image?
83. Change color of PNG image via CSS?
84. css transition opacity fade background
85. Better way to set distance between flexbox items
86. Text-decoration: none not working
87. How to set up fixed width for ?
88. How do I center an h1 in the body
89. CSS3 Transition not working
90. How do I rotate text in css?
91. CSS Invalid Property Value?
92. right align an image using CSS HTML
93. How can I transition height: 0; to height: auto; using CSS?
94. css to make bootstrap navbar transparent
95. how to offset a CSS border up and left
96. @Media min-width & max-width
97. CSS display: inline vs inline-block
98. css: how to center box div element directly in center?
99. How do I center this form in css?
100. How to apply a CSS filter to a background image
101. Aligning two divs side-by-side