* { margin:0; padding:0; }
.box { outline: none; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; resize: none; }
.output { position:absolute; top:0; right:0; overflow: auto; }

body {
    line-height: 3;
    font-family: sans-serif;

}

div {
    position: relative;
}

ul {
    list-style: none;
    text-indent: .5em;
    border-left: .25em solid gray;
}

ul ul {
    margin-top: -1.25em;
    margin-left: 1em;

}

li {
    position: relative;
}

li:before {
    content: "";
    display: inline-block;
    width: 2em;
    height: 0;
    position: relative;
    left: -.75em;
    border-top: .25em solid gray;
}

ul ul:before, h3:before, li:after {
    content: '';
    display: block;
    width: 1em;
    height: 1em;
    position: absolute;
    background: salmon;
    border: .25em solid white;
    top: 1em;
    left: .4em;
}

h3 {
    position: absolute;
    top: -1em;
    left: 1.75em;
}

h3:before {
    left: -2.25em;
    top: .5em;
}