spiff-arena/bpmn-js-spiffworkflow/app/css/app.css

html, body {
  height: 100%;
}

.hidden {
  display: none;
}

#container {
  display: flex;
  width: 100%;
  height: 100%;
}

#modeler {
  flex-grow: 1;
}

#panel {
  background-color: #fafafa;
  border: solid 1px #ccc;
  border-radius: 2px;
  font-family: 'Arial', sans-serif;
  padding: 10px;
  min-width: 400px;
}

.djs-label {
  font-family: 'Arial', sans-serif;
}

.spiffworkflow-properties-panel-button {
  margin: 2px 32px 6px 12px;
  padding-left: 2px;
  padding-right: 2px;
}

/* Style buttons */
.bpmn-js-spiffworkflow-btn {
  background-color: DodgerBlue;
  border: none;
  color: white;
  padding: 8px 15px;
  cursor: pointer;
  font-size: 16px;
  margin: 12px;
}

/* Darker background on mouse-over */
.bpmn-js-spiffworkflow-btn:hover {
  background-color: RoyalBlue;
}

/* Code Editor -- provided as a div overlay */
.overlay {
  position: fixed; /* Sit on top of the page content */
  display: none; /* Hidden by default */
  width: 100%; /* Full width (cover the whole page) */
  height: 100%; /* Full height (cover the whole page) */
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.5); /* Black background with opacity */
  z-index: 200; /* BPMN Canvas has some huge z-indexes, pop-up tools are 100 for ex.*/
}

#code_editor, #markdown_editor {
  background-color: #ccc;
  margin: 50px auto 10px auto;
  max-width: 800px;
}

#code_buttons, #markdown_buttons {
  margin: 50px auto 10px auto;
  max-width: 800px;
  right: 10px;
}