html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    width: 100%;
}

body {
    margin-left: 60px;
    margin-top: 60px;
}

.ruler-vertical {
    position: fixed;
    top: 0;
    z-index: 0;
    width: 60px;
    height: 100%;
    background-color: black;
    padding-top: 60px;
}

.ruler-horizontal {
    position: fixed;
    top: 0;
    z-index: 1;
    width: 100%;
    height: 60px;
    padding-left: 60px;
    background-color: black;
}

.ruler-horizontal svg, .ruler-vertical svg {
    width: 100%;
    height: 100%;
}

.ruler-vertical div, .ruler-horizontal div {
    width: 80px;
    height: 80px;
}

.content {
    width: 100%;
    height: 100%;
    padding-top: 60px;
    padding-left: 60px;
    position: fixed;
}

#scroll {
    width: 100%;
    height: 100%;
    overflow: scroll;
}

.black-rect {
    position: fixed;
    background-color: black;
    width: 60px;
    height: 60px;
    z-index: 10;
}

#svgV,
#svgH {
    overflow: visible;
}