index.css

body {
	font-family: Arial;
	font: 10px sans-serif;
}
div{
    background-color:rgb(241, 247, 246);
}
h1{
	font-family: Arial, Helvetica, sans-serif;
	text-align:center;
}
/* Style the tab */
.tab {
    overflow: hidden;
    border: 1px solid #ccc;
    background-color: #f1f1f1;
}


/* Style the buttons inside the tab */
.tab button {
    background-color: inherit;
    float: left;
    border: none;
    outline: none;
    cursor: pointer;
    padding: 14px 16px;
    transition: 0.3s;
    font-size: 17px;
}

/* Change background color of buttons on hover */
.tab button:hover {
    background-color: #ddd;
}

/* Create an active/current tablink class */
.tab button.active {
    background-color: #ccc;
}

/* Style the tab content */
.tabcontent {
    display: none;
    padding: 6px 12px;
    border: 1px solid #ccc;
    border-top: none;
}

#tooltip {
        opacity: 0;
        position: absolute;
        text-align: center;
        width: 100px;
        height: 60px;
        background-color: rgba(220, 220, 220, 1);
        color: #333;
        -webkit-border-radius: 20px;
        -moz-border-radius: 20px;
        border-radius: 20px;
    }


    .axis path,
    .axis line {
        fill: none;
        stroke: #000;
        shape-rendering: crispEdges;
    }

    .layer text {
        text-anchor: end;
    }
	
	svg {
        font: 10px sans-serif;
    }

    .background path {
        fill: none;
        stroke: #ccc;
        stroke-opacity: .4;
        shape-rendering: crispEdges;
    }

    .foreground path {
        fill: none;
        stroke: steelblue;
        stroke-opacity: .7;
    }

    .brush .extent {
        fill-opacity: .3;
        stroke: #fff;
        shape-rendering: crispEdges;
    }

    .axis line,
    .axis path {
        fill: none;
        stroke: #000;
        shape-rendering: crispEdges;
    }

    .axis text {
        text-shadow: 0 1px 0 #fff;
        cursor: move;
    }
	
ul,ol,dl,p {
  font-size: 1rem;
}

li, p {
  line-height: 1.5;
}

p {
	text-indent: 1em;
    font-size: 14px;
}
div.tooltip {	
    position: absolute;			
    text-align: left;			
    padding: 2px;				
    font: 18px calibri;		
    pointer-events: none;			
}