.domestic {
    fill: steelblue;
}

.foreign {
    fill: firebrick;
}

.map {
    fill: gray;
}

.map:hover {
    fill: black;
    
}

.node {
    fill: blue;
    stroke: blue;
}

h1 {
    text-align: center;
    color: yellow;
}

.link{
    transform: rotate(180deg) rotate(-180deg);
    transform-origin: 50% 50%;
}

svg{
    display: block;
    margin: auto;
}

.tooltip{
    font-family:simsun;
    font-size:16px;
    width:120;
    height:auto;
    position:absolute; 
    text-align:center;
    border-style:solid;
    border-width:1px;
    background-color:white;
    border-radius:5px;	
}