plugins/codemirror/addon/lint/lint.css

/* The lint marker gutter */
.CodeMirror-lint-markers {
  width: 16px;
}

.CodeMirror-lint-tooltip {
  background-color: #ffd;
  border: 1px solid black;
  border-radius: 4px 4px 4px 4px;
  color: black;
  font-family: monospace;
  font-size: 10pt;
  overflow: hidden;
  padding: 2px 5px;
  position: fixed;
  white-space: pre;
  white-space: pre-wrap;
  z-index: 100;
  max-width: 600px;
  opacity: 0;
  transition: opacity .4s;
  -moz-transition: opacity .4s;
  -webkit-transition: opacity .4s;
  -o-transition: opacity .4s;
  -ms-transition: opacity .4s;
}

.CodeMirror-lint-mark-error, .CodeMirror-lint-mark-warning {
  background-position: left bottom;
  background-repeat: repeat-x;
}

.CodeMirror-lint-mark-error {
  background-image:
  url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAADCAYAAAC09K7GAAAAAXNSR0IArs4c6QAAAAZiS0dEAP8A/wD/oL2nkwAAAAlwSFlzAAALEwAACxMBAJqcGAAAAAd0SU1FB9sJDw4cOCW1/KIAAAAZdEVYdENvbW1lbnQAQ3JlYXRlZCB3aXRoIEdJTVBXgQ4XAAAAHElEQVQI12NggIL/DAz/GdA5/xkY/qPKMDAwAADLZwf5rvm+LQAAAABJRU5ErkJggg==")
  ;
}

.CodeMirror-lint-mark-warning {
  background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAADCAYAAAC09K7GAAAAAXNSR0IArs4c6QAAAAZiS0dEAP8A/wD/oL2nkwAAAAlwSFlzAAALEwAACxMBAJqcGAAAAAd0SU1FB9sJFhQXEbhTg7YAAAAZdEVYdENvbW1lbnQAQ3JlYXRlZCB3aXRoIEdJTVBXgQ4XAAAAMklEQVQI12NkgIIvJ3QXMjAwdDN+OaEbysDA4MPAwNDNwMCwiOHLCd1zX07o6kBVGQEAKBANtobskNMAAAAASUVORK5CYII=");
}

.CodeMirror-lint-marker-error, .CodeMirror-lint-marker-warning {
  background-position: center center;
  background-repeat: no-repeat;
  cursor: pointer;
  display: inline-block;
  height: 16px;
  width: 16px;
  vertical-align: middle;
  position: relative;
}

.CodeMirror-lint-message-error, .CodeMirror-lint-message-warning {
  padding-left: 18px;
  background-position: top left;
  background-repeat: no-repeat;
}

.CodeMirror-lint-marker-error, .CodeMirror-lint-message-error {
  background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAAHlBMVEW7AAC7AACxAAC7AAC7AAAAAAC4AAC5AAD///+7AAAUdclpAAAABnRSTlMXnORSiwCK0ZKSAAAATUlEQVR42mWPOQ7AQAgDuQLx/z8csYRmPRIFIwRGnosRrpamvkKi0FTIiMASR3hhKW+hAN6/tIWhu9PDWiTGNEkTtIOucA5Oyr9ckPgAWm0GPBog6v4AAAAASUVORK5CYII=");
}

.CodeMirror-lint-marker-warning, .CodeMirror-lint-message-warning {
  background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAANlBMVEX/uwDvrwD/uwD/uwD/uwD/uwD/uwD/uwD/uwD6twD/uwAAAADurwD2tQD7uAD+ugAAAAD/uwDhmeTRAAAADHRSTlMJ8mN1EYcbmiixgACm7WbuAAAAVklEQVR42n3PUQqAIBBFUU1LLc3u/jdbOJoW1P08DA9Gba8+YWJ6gNJoNYIBzAA2chBth5kLmG9YUoG0NHAUwFXwO9LuBQL1giCQb8gC9Oro2vp5rncCIY8L8uEx5ZkAAAAASUVORK5CYII=");
}

.CodeMirror-lint-marker-multiple {
  background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAcAAAAHCAMAAADzjKfhAAAACVBMVEUAAAAAAAC/v7914kyHAAAAAXRSTlMAQObYZgAAACNJREFUeNo1ioEJAAAIwmz/H90iFFSGJgFMe3gaLZ0od+9/AQZ0ADosbYraAAAAAElFTkSuQmCC");
  background-repeat: no-repeat;
  background-position: right bottom;
  width: 100%; height: 100%;
}