Fix PHPCS Errors and warnings

PHPCS reported the following errors and warnings :

FILE: /fsk_frontend/css/base/variables.css
----------------------------------------------------------------------------------------------
FOUND 59 ERRORS AFFECTING 49 LINES
----------------------------------------------------------------------------------------------
  14 | ERROR | [x] Blank lines are not allowed in class definitions
  23 | ERROR | [x] Blank lines are not allowed in class definitions
  30 | ERROR | [x] Blank lines are not allowed in class definitions
  32 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
  33 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
  35 | ERROR | [ ] Style definitions must end with a semicolon
  36 | ERROR | [ ] Style definitions must end with a semicolon
  37 | ERROR | [ ] Style definitions must end with a semicolon
  38 | ERROR | [ ] Style definitions must end with a semicolon
  39 | ERROR | [ ] Style definitions must end with a semicolon
  40 | ERROR | [x] Blank lines are not allowed in class definitions
  57 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
  57 | ERROR | [ ] No style definition found on line; check for missing colon
  58 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 6
  58 | ERROR | [ ] No style definition found on line; check for missing colon
  69 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
  69 | ERROR | [ ] No style definition found on line; check for missing colon
  70 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 6
  70 | ERROR | [ ] No style definition found on line; check for missing colon
  72 | ERROR | [x] Blank lines are not allowed in class definitions
  77 | ERROR | [x] Blank lines are not allowed in class definitions
  93 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
  93 | ERROR | [ ] No style definition found on line; check for missing colon
  97 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
  97 | ERROR | [ ] No style definition found on line; check for missing colon
 103 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
 103 | ERROR | [ ] No style definition found on line; check for missing colon
 104 | ERROR | [x] Blank lines are not allowed in class definitions
 111 | ERROR | [x] Blank lines are not allowed in class definitions
 117 | ERROR | [x] Blank lines are not allowed in class definitions
 126 | ERROR | [x] Blank lines are not allowed in class definitions
 147 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
 147 | ERROR | [ ] No style definition found on line; check for missing colon
 148 | ERROR | [x] Blank lines are not allowed in class definitions
 150 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
 151 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
 165 | ERROR | [x] Blank lines are not allowed in class definitions
 167 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
 168 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
 175 | ERROR | [x] Blank lines are not allowed in class definitions
 177 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
 178 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
 196 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 6
 196 | ERROR | [ ] No style definition found on line; check for missing colon
 197 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
 198 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
 198 | ERROR | [ ] No style definition found on line; check for missing colon
 200 | ERROR | [x] Blank lines are not allowed in class definitions
 202 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
 203 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
 217 | ERROR | [x] Blank lines are not allowed in class definitions
 219 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
 220 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
 229 | ERROR | [x] Blank lines are not allowed in class definitions
 231 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
 232 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
 237 | ERROR | [x] Blank lines are not allowed in class definitions
 239 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
 240 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 0
----------------------------------------------------------------------------------------------
PHPCBF CAN FIX THE 44 MARKED SNIFF VIOLATIONS AUTOMATICALLY
----------------------------------------------------------------------------------------------


FILE: /fsk_frontend/templates/form/input/input--checkbox/input--checkbox.css
--------------------------------------------------------------------------------------------------------------------------------
FOUND 2 ERRORS AFFECTING 1 LINE
--------------------------------------------------------------------------------------------------------------------------------
 30 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
 30 | ERROR | [ ] No style definition found on line; check for missing colon
--------------------------------------------------------------------------------------------------------------------------------
PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
--------------------------------------------------------------------------------------------------------------------------------


FILE: /fsk_frontend/templates/form/input/input--radio/input--radio.css
--------------------------------------------------------------------------------------------------------------------------
FOUND 2 ERRORS AFFECTING 1 LINE
--------------------------------------------------------------------------------------------------------------------------
 31 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
 31 | ERROR | [ ] No style definition found on line; check for missing colon
--------------------------------------------------------------------------------------------------------------------------
PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
--------------------------------------------------------------------------------------------------------------------------


FILE: /fsk_frontend/templates/form/vertical-tabs/vertical-tabs.css
----------------------------------------------------------------------------------------------------------------------
FOUND 8 ERRORS AFFECTING 7 LINES
----------------------------------------------------------------------------------------------------------------------
  84 | ERROR | [x] Selectors must be on a single line
  85 | ERROR | [x] Line indented incorrectly; expected 0 spaces, found 2
  97 | ERROR | [x] Selectors must be on a single line
  98 | ERROR | [x] Line indented incorrectly; expected 0 spaces, found 2
 195 | ERROR | [x] Selectors must be on a single line
 196 | ERROR | [x] Line indented incorrectly; expected 0 spaces, found 2
 196 | ERROR | [x] Selectors must be on a single line
 197 | ERROR | [x] Line indented incorrectly; expected 0 spaces, found 2
----------------------------------------------------------------------------------------------------------------------
PHPCBF CAN FIX THE 8 MARKED SNIFF VIOLATIONS AUTOMATICALLY
----------------------------------------------------------------------------------------------------------------------


FILE:/fsk_frontend/templates/form/dropbutton-wrapper/dropbutton-wrapper.css
--------------------------------------------------------------------------------------------------------------------------------
FOUND 2 ERRORS AFFECTING 1 LINE
--------------------------------------------------------------------------------------------------------------------------------
 56 | ERROR | [x] Line indented incorrectly; expected 2 spaces, found 4
 56 | ERROR | [ ] No style definition found on line; check for missing colon
--------------------------------------------------------------------------------------------------------------------------------
PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
--------------------------------------------------------------------------------------------------------------------------------