.gene-line {
    stroke: black;
    stroke-width: 1px;
    opacity: 0.5;
}

.gene-circle {
    stroke: black;
    stroke-width: 1px;
    opacity: 1;
}

.exon-rect {
    fill: black;
    opacity: 1;
}

.arrow-line {
    stroke: black;
    stroke-width: 1px;
    opacity: 0.5;
}