.link {
    fill: none;
    stroke: #696969;
    stroke-width: 2px;
}

.link line {
  stroke: #696969;
}

.link line.separator {
  stroke: #FFF;
  stroke-width: 2px;
}

.node circle {
  stroke: #000;
  stroke-width: 3px;
}

.atom-H {
    fill: #E9E9E9;
    stroke: #B4B4B4;
    stroke-width: 2px;
}

.atom-He {
    fill: #37A1E7;
    stroke: #3295D5;
    stroke-width: 1px;
}

.atom-B {
    fill: #CDB966;
    stroke: #BCAB5E;
    stroke-width: 1px;
}

.atom-C {
    fill: #242729;
    stroke: #24282A;
    stroke-width: 1px;
}

.atom-N {
    fill: #4255E9;
    stroke: #3444C5;
    stroke-width: 1px;
}

.atom-O {
    fill: #EB3941;
    stroke: #C12D36;
    stroke-width: 1px;
}

.atom-F {
    fill: #AC49E3;
    stroke: #9D42D0;
    stroke-width: 1px;
}

.atom-Na {
    fill: #AB5CF2;
    stroke: #A66CE0;
    stroke-width: 1px;
}

.atom-Si {
    fill: #959595;
    stroke: #7C7C7C;
    stroke-width: 1px;
}

.atom-P {
    fill: #00AE78;
    stroke: #009D6D;
    stroke-width: 1px;
}

.atom-S {
    fill: #FFE382;
    stroke: #F3D379;
    stroke-width: 1px;
}

.atom-Cl {
    fill: #00BB00;
    stroke: #00A200;
    stroke-width: 1px;
}

.atom-As {
    fill: #827340;
    stroke: #726437;
    stroke-width: 1px;
}

.atom-Se {
    fill: #B40409;
    stroke: #A2030C;
    stroke-width: 1px;
}

.atom-Br {
    fill: #F08F27;
    stroke: #DB8226;
    stroke-width: 1px;
}

.atom-I {
    fill: #2C4DA7;
    stroke: #274496;
    stroke-width: 1px;
}