style.css

/* importing fonts from Google Font API */
@import url('https://fonts.googleapis.com/css?family=Major+Mono+Display');
@import url('https://fonts.googleapis.com/css?family=Sarabun:300,300i,400,700');

html {
    background: darkturquoise;
    min-width: 1280px;
    min-height: 720px;
    overflow: auto;

    font-family: "Sarabun", sans-serif;
    font-weight: 300;
    color: white;
    letter-spacing: 0.1em;
}

body {
    padding: 20px;
}

h1{
    font-family: "Major Mono Display", sans-serif;
    font-size: 3em;

    color: white;
    letter-spacing: normal;
    text-transform: lowercase;

    margin-bottom: 0;
    padding-bottom: 0;
}

h2 {
    font-family: "Major Mono Display", sans-serif;
    font-size: 1.5em;
    letter-spacing: normal;
    text-transform: lowercase;
}

/* styling an element through its ID */
div#div_page_desc {
    margin: 10px;
}

div#div_data_desc {
    background: beige;
    box-sizing: border-box;
    padding: 10px 20px;

    color: black;
}

div#div_visuals {
    background: beige;
    background-clip: content-box;
    width: 100%;
    height: 100%;
    min-height: 700px;
    box-sizing: border-box;
    padding: 10px;
}

div#div_buttons {
    padding: 20px;
}

button {
    background: beige;
    border: none;
    height: 30px;
    padding: 0px 10px;

    font-family: "Sarabun", sans-serif;
    font-weight: 400;
    font-size: 1em;
    letter-spacing: 0.1em;
}

button:hover {
    background: darkturquoise;
    cursor: pointer;
}

button:focus {
    outline: 0;
}


#vis {
    background: beige;
    display: block;
    width: 90%;
    height: 100%;
    min-width: 800px;
    min-height: 500px;
    /*box-sizing: border-box;*/
    margin: auto;
    z-index: 1;
}
.rect {
    stroke: black;
    stroke-width: 1;
}

.toolTip {
    position: absolute;
    display: none;
    min-width: 80px;
    height: auto;
    background: none repeat scroll 0 0 #ffffff;
    border: 1px solid #6F257F;
    padding: 14px;
    text-align: center;
    z-index: 2;
}

.domain,
.tick,
.tick path,
.tick line {
    fill: none;
    stroke: black;
    shape-rendering: crispEdges;
}

.domain text,
.tick,
.tick text {
    font-family: "Sarabun", sans-serif;
    font-size: 1em;
}