declaration-colon-newline-after
Require a newline or disallow whitespace after the colon of declarations.
a {
  box-shadow:
    0 0 0 1px #5b9dd9,
    0 0 2px 1px rgba(30, 140, 190, 0.8);
}        /* ↑ */
/**         ↑
 * The newline after this colon */The fix
option can automatically fix all of the problems reported by this
rule.
Options
string: "always"|"always-multi-line"
"always"
There must always be a newline after the colon.
The following patterns are considered violations:
a { color:pink; }a { color: pink; }The following patterns are not considered violations:
a {
  color:
    pink;
}"always-multi-line"
There must always be a newline after the colon if the declaration’s value is multi-line.
The following patterns are considered violations:
a {
  box-shadow: 0 0 0 1px #5b9dd9,
    0 0 2px 1px rgba(30, 140, 190, 0.8);
}The following patterns are not considered violations:
a {
  box-shadow:
    0 0 0 1px #5b9dd9,
    0 0 2px 1px rgba(30, 140, 190, 0.8);
}a {
  color: pink;
}