.node {
     position:absolute;
     width: 100px;
     height: 50px;
     border: 2px solid black;
 }


/**
 * Anchors
 */
.anchors {
    position: absolute;
    border-radius: 1em;
    z-index: 20;
    display: none;
    background-color: black;
    width: 0;
    height: 0;
    cursor: pointer;
    -ms-transition: all 0.15s ease-in-out;
    transition: all 0.15s ease-in-out;
    -moz-transition: all 0.15s ease-in-out;
    -webkit-transition: all 0.15s ease-in-out;
    -o-transition: all 0.15s ease-in-out;
}

.node:hover .anchors {
    background-color: black;
    display: inline-block;
    width: 12px;
    height: 12px;
    z-index: 20;
}

.anchor-left {
    left: -5px;
    top: 40%;
}

.anchor-right {
    right: -5px;
    top: 40%;
}

.anchor-top {
    top: -5px;
    left: 40%;
}

.anchor-bottom {
    bottom: -5px;
    left: 40%;
}

/*右箭头*/
.right {
    width: 10px;
    height: 10px;
    position: absolute;
    left: 4px;
    top: 1px;

}

.right-arrow1, .right-arrow2 {
    width: 0;
    height: 0;
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    border-top: 5px transparent dashed;
    border-right: 5px transparent dashed;
    border-bottom: 5px transparent dashed;
    border-left: 5px black solid;
    overflow: hidden;
}

.right-arrow1 {

    border-left: 5px white solid;
}

.right-arrow2 {
    left: -2px;
}

/*左箭头*/
.left {
    width: 10px;
    height: 10px;
    position: absolute;
    left: -2px;
    top: 1px;
    z-index: 2;
}

.left-arrow1, .left-arrow2 {
    width: 0;
    height: 0;
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    z-index: 5; /*兼容ie8-*/
    border-top: 5px transparent dashed;
    border-left: 5px transparent dashed;
    border-bottom: 5px transparent dashed;
    border-right: 5px black solid;
    overflow: hidden;
}

.left-arrow1 {
    border-right: 5px #fff solid;
}

.left-arrow2 {
    left: 2px;
}

/*上箭头*/
.top {
    width: 9px;
    height: 9px;
    position: absolute;
    left: 1px;
    z-index: 2;
}

.top-arrow1, .top-arrow2 {
    width: 0;
    height: 0;
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    z-index: 5;
    border-bottom: 5px black solid;
    border-left: 5px transparent dashed;
    border-right: 5px transparent dashed;
    border-top: 5px transparent dashed;
    overflow: hidden;
}

.top-arrow1 {
    z-index: 6;
}

.top-arrow2 {
    top: -2px;
    border-bottom: 4px white solid;
}

/*下箭头*/
.bottom {
    width: 9px;
    height: 9px;
    position: absolute;
    left: 1px;
    top: 4px;
    z-index: 2;
}

.bottom-arrow1, .bottom-arrow2 {
    width: 0;
    height: 0;
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    z-index: 5;
    border-bottom: 4px transparent dashed;
    border-left: 4px transparent dashed;
    border-right: 4px transparent dashed;
    border-top: 4px black solid;
    overflow: hidden;
}

.bottom-arrow1 {
    top: -2px;
    z-index: 6;
}

.bottom-arrow2 {
    border-top: 4px white solid;
}