ZenUML (www.zenuml.com) handwritten style by @Mayra

zenuml-handwritten.css

@import url('https://fonts.googleapis.com/css?family=Shadows+Into+Light+Two');

#diagram .message {
  border-bottom: blue 2px solid;
  border-bottom-left-radius:500px 20px;
}

#diagram .message.return {
  border-bottom: red 2px solid;
  border-bottom-right-radius: 500px 20px;
  border-bottom-left-radius:0px 0px;
}

#diagram #A {
  background-color: rgba(250,240,200);
}

#diagram div {
  font-family: 'Shadows Into Light Two', cursive;
  font-size: 17px;
}

#diagram .occurrence {
  background-color: lightblue;
}

#diagram .line {
  border-left-color: orange;
}

#diagram .participant {
  border-color: orange;
  background-color: rgb(250,220,220);
}

#diagram .comments {
  background-color: lightcyan;  
  color: darkcyan;
}