bpmn-js/example/diagram-js.css

/**
 * outline styles
 */
.djs-outline {
  fill: none;
  visibility: hidden;
}

.djs-group.hover .djs-outline,
.djs-group.selected .djs-outline {
  visibility: visible;
  stroke-dasharray: 2,4;
}

.djs-group.selected .djs-outline {
  stroke: blue;
  stroke-width: 1px;
}

.djs-group.hover .djs-outline {
  stroke: red;
  stroke-width: 1px;
}

.djs-group.drop-ok .djs-visual {
  fill: green;
}

.djs-group.drop-not-ok .djs-visual {
  fill: red;
}

/**
 * drag styles
 */
.djs-dragger {
  fill: white;
  opacity: 0.3;
  stroke: #333;
  stroke-dasharray: 2,1;
}

.djs-shape.djs-dragging {
  visibility: hidden;
}

/**
 * hit shape styles
 */
.djs-hit {
  stroke-opacity: 0.0;
  stroke-width: 10px;
  stroke: fuchsia;
  fill: none;
}

/**
 * shape / connection basic styles
 */
.djs-shape .djs-visual { }

.djs-connection .djs-visual {
  stroke-width: 2px;
  fill: none;
}

.djs-connection .djs-bendpoint {
  visibility: hidden;
}

.djs-connection:hover .djs-bendpoint {
  visibility: visible;
}

.djs-connection .djs-bendpoint:hover {
  stroke: #CCC;
  stroke-width: 1px;
  fill: yellow;
}

.djs-connection-marker {
  fill: black;
  stroke: none;
}

.djs-menu-vertical, .djs-menu-horizontal {
    height: 35px;
    background-color: #52B415;
    padding-left: 10px;
}
.djs-menu-vertical > button {
    display:inline-block;
    margin-bottom:0;
    font-weight:400;
    text-align:center;
    vertical-align:middle;
    cursor:pointer;
    background: #52B415 none;
    color: white;
    border: 0px #ffffff;
    border-right-width: 1px;
    border-bottom-style: solid;
    border-left-width: 1px;
    white-space:nowrap;
    padding:5px 12px;
    font-size:15px;
    line-height:1.428571429;
    -webkit-user-select:none;
    -moz-user-select:none;
    -ms-user-select:none;
    user-select:none;
}
.djs-menu-vertical >  .button:focus{
    outline:thin dotted #333;
    outline:5px auto -webkit-focus-ring-color;
    outline-offset:-2px;
}
.djs-menu-vertical >  .btn:hover,.btn:focus {
    color:#707070;text-decoration:none;
}

.djs-menu-brand {
    background: url("logo.png")  scroll no-repeat transparent;
    background-size: 35px 35px;
    width: 35px;
    height: 35px;
    float: right;
}

/* Button icons*/
.djs-undo-button > i:before {
    font-family: awesomesymbols;
    content: "\f0e2";
    font-style: normal;
}

.djs-redo-button > i:before {
    font-family: awesomesymbols;
    content: "\f01e";
    font-style: normal;
}

.djs-rect-button > i {
    width: 10px;
    height: 10px;
    border: 1px solid;
    display: block;
}

/* Fonts */
@font-face {
    font-family: "awesomesymbols";
    src: url("../fonts/fontawesome-webfont.woff") format('woff');
    font-weight: normal;
}