div.vis-network div.vis-navigation div.vis-button {
    width:34px;
    height:34px;
    -moz-border-radius: 17px;
    border-radius: 17px;
    position:absolute;
    display:inline-block;
    background-position: 2px 2px;
    background-repeat:no-repeat;
    cursor: pointer;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

div.vis-network div.vis-navigation div.vis-button:hover {
    box-shadow: 0 0 3px 3px rgba(56, 207, 21, 0.30);
}

div.vis-network div.vis-navigation div.vis-button:active {
    box-shadow: 0 0 1px 3px rgba(56, 207, 21, 0.95);
}

div.vis-network div.vis-navigation div.vis-button.vis-up {
    background-image: url("img/network/upArrow.png");
    bottom:50px;
    left:55px;
}
div.vis-network div.vis-navigation div.vis-button.vis-down {
    background-image: url("img/network/downArrow.png");
    bottom:10px;
    left:55px;
}
div.vis-network div.vis-navigation div.vis-button.vis-left {
    background-image: url("img/network/leftArrow.png");
    bottom:10px;
    left:15px;
}
div.vis-network div.vis-navigation div.vis-button.vis-right {
    background-image: url("img/network/rightArrow.png");
    bottom:10px;
    left:95px;
}
div.vis-network div.vis-navigation div.vis-button.vis-zoomIn {
    background-image: url("img/network/plus.png");
    bottom:10px;
    right:15px;
}
div.vis-network div.vis-navigation div.vis-button.vis-zoomOut {
    background-image: url("img/network/minus.png");
    bottom:10px;
    right:55px;
}
div.vis-network div.vis-navigation div.vis-button.vis-zoomExtends {
    background-image: url("img/network/zoomExtends.png");
    bottom:50px;
    right:15px;
}