style.css

html {
   margin: 0px;
   height: 100%;
   width: 100%;
}

body {
   margin: 0px;
   min-height: 100%;
   width: 100%;
}
ASIDE {
    width: 250px;
    height: auto;

    top: 1px;
margin:auto;
    border: 1px solid #333; 
    padding: 10px;
    background: #fff;
   background: linear-gradient(to bottom, #f2f5f6 0%,#ffffff 1%,#d1d1d1 3%,#e3eaed 68%,#e3eaed 68%,#ffffff 96%,#c8d7dc 100%);
}
ASIDE P {
    margin-left: 20px;
}
#mindmap_container {
    width: 100%;
    height: 100vh;
    position: relative;
    background: linear-gradient(to bottom, rgba(147, 206, 222, 1) 0%, rgba(117, 189, 209, 0.87) 41%, rgba(73, 165, 191, 0.68) 100%);
    display: block;
    text-align:center;
}

div.node {
    min-width: 120px;
    min-height: 60px;
    position: absolute;
    border-radius: 10px;
    box-shadow: 3px 3px 7px #828282;
    line-height: 1;
    text-align: center;
    border: 1px solid #E8E8E8;
    font-family: 'Reenie Beanie';
    background: rgba(255, 255, 136, 0.9);
    z-index: 1;
}

div.master {
    background: transparent;
    background-color: transparent;
    content: "";
    background: url(assets/brain.png);
    background-position:20px 0;
    background-repeat: no-repeat;
    width: 160px;
    height: 132px;
    box-shadow: none;
    border: none;
    z-index: 1;
    padding-bottom: 33px;
    padding-right: 20px;
}

div.node span {
    padding: 6px;
    display: block;
    max-width: 150px;
    word-wrap: break-word;
    margin: 15px 5px 25px 5px;
    border-bottom: 2px solid #aeadad;
    border-left: 2px solid #aeadad;
    border-top: 2px solid #fff;
    border-right: 2px solid #fff;
    border-radius: 10px;
}

.master_span {
    content: "";
    background-color: white;
    padding: 7px !important;
    min-width: 180px;
    position: absolute;
    bottom: -27px;
    border: 2px solid #2d2c2c !important;
    border-radius: 25px !important;
    box-shadow: 3px 3px 7px #828282;
    display: none;
    pointer-events: none;
}

.hide {
    transform: translateX(-9999px);
}

.dragging {
    box-shadow: -1px 2px 5px 1px rgba(0, 0, 0, 0.7);
    z-index: 2;
}

canvas {
    z-index: 0;
}

.add {
    position: absolute;
    display: block;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: url(assets/add.png);
    text-indent: -99999em;
    overflow: hidden;
    bottom: 2px;
    right: 5px;
    user-select: none;
    -webkit-user-drag: none;
    -webkit-user-select: none;
    box-shadow: 1px 1px 1px 1px rgba(0, 0, 0, 0.4);
}

.left {
    left: 5px;
}

.delete {
    position: absolute;
    display: block;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: url(assets/remove.png);
    text-indent: -99999em;
    overflow: hidden;
    bottom: 2px;
    margin: 0 auto;
    user-select: none;
    -webkit-user-drag: none;
    -webkit-user-select: none;
    box-shadow: 1px 1px 1px 1px rgba(0, 0, 0, 0.4);
}