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HTML 

              
                <div class="widget-wrap">
  <div id="chart"></div>
  <h1>SIMPLE BAR CHART</h1>
  
  <!-- (A) HORIZONTAL BAR CHART -->
  <div id="demoA"></div>
  
  <!-- (B) VERTICAL BAR CHART -->
  <div id="demoB"></div>
  
  <!-- (X) VISIT CODE-BOXX -->
  <div id="code-boxx">
    Visit
    <a href="https://code-boxx.com/simple-bar-chart-pure-css-js/"
       target="_blank">
      Code Boxx
    </a> for more details.
  </div>
</div>
!

CSS 

              
                /* (A) SHARED FONT & SIZING */
.hbar, .vbar, .hbar *, .vbar * {
  font-family: Arial, Helvetica, sans-serif;
  box-sizing: border-box;
}
 
/* (B) BAR CHART CONTAINER */
/* (B1) SHARED */
.hbar, .vbar {
  display: flex;
  width: 100%;
  border: 1px solid #333;
  margin: 20px 0;
}
 
/* (B2) HORIZONTAL */
.hbar {
  flex-direction: column;
  background: repeating-linear-gradient(
    to right, #f2f2f2, #ddd 2px, #fff 2px, #fff 5%
  );
}
 
/* (B3) VERTICAL */
.vbar {
  align-items: flex-end;
  height: 400px;
  background: repeating-linear-gradient(
    to bottom, #f2f2f2, #ddd 2px, #fff 2px, #fff 10%
  );
}
 
/* (C) EACH INDIVIDUAL BAR */
/* (C1) SHARED */
.hbar div, .vbar div {
  color: #fff;
  padding: 10px;
}
 
/* (C2) HORIZONTAL */
.hbar div { margin: 5px 0; }
 
/* (C3) VERTICAL */
.vbar div { width: 100%; }

/* (X) THE REST DOES NOT MATTER - COSMETICS */
/* PAGE & BODY */
* {
  font-family: arial, sans-serif;
  box-sizing: border-box;
}
body {
  display: flex;
  align-items: center; justify-content: center;
  min-height: 100vh;
  background-image: url(https://images.unsplash.com/photo-1523380360198-653413ad178b?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTY0NjcyNTcwNw&ixlib=rb-1.2.1&q=85);
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  text-align: center;
}

/* WIDGET */
.widget-wrap {
  width: 600px;
  padding: 30px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.4);
}

/* SVG */
#chart {
  width: 100%; height:120px;
  background-image: url('data:image/svg+xml;utf8,<svg viewBox="0 0 512 512" width="100" xmlns="http://www.w3.org/2000/svg"><path d="M332.8 320h38.4c6.4 0 12.8-6.4 12.8-12.8V172.8c0-6.4-6.4-12.8-12.8-12.8h-38.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h38.4c6.4 0 12.8-6.4 12.8-12.8V76.8c0-6.4-6.4-12.8-12.8-12.8h-38.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-288 0h38.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-38.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h38.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-38.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zM496 384H64V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-32c0-8.84-7.16-16-16-16z" /></svg>');
  background-repeat: no-repeat;
  background-position: center;
}

/* FOOTER */
#code-boxx {
  font-weight: 600;
  margin-top: 30px;
}
#code-boxx a {
  display: inline-block;
  padding: 5px;
  text-decoration: none;
  background: #b90a0a;
  color: #fff;
}
!

JS 

              
                var bchart = {
  // (A) HELPER FUNCTION - GENERATE RANDOM DARK COLOR
  // source: https://gist.github.com/Chak10/dc24c61c9bf2f651cb6d290eeef864c1
  rcolor : () => {
    let lum = -0.25, rgb = "#", c, i,
        hex = String("#" + Math.random().toString(16).slice(2, 8).toUpperCase()).replace(/[^0-9a-f]/gi, "");
    if (hex.length < 6) { hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2]; }
    for (i = 0; i < 3; i++) {
      c = parseInt(hex.substr(i * 2, 2), 16);
      c = Math.round(Math.min(Math.max(0, c + (c * lum)), 255)).toString(16);
      rgb += ("00" + c).substr(c.length);
    }
    return rgb;
  },
 
  // (B) DRAW BAR CHART
  draw : instance => {
    // (B1) INIT CHART CONTAINER
    let hor = instance.type=="h";
    instance.target.classList.add((hor ? "hbar" : "vbar"));
    instance.target.innerHTML = "";
 
    // (B2) GET LARGEST VALUE FROM DATA
    let largest = 0;
    instance.data.forEach(el => {
      if (el[1] > largest) { largest = el[1]; }
    });
 
    // (B3) DRAW CHART
    let bars = new DocumentFragment(), bar, percent;
    instance.data.forEach(el => {
      // (B3-1) CREATE <DIV> BAR
      bar = document.createElement("div");
      bars.appendChild(bar);
 
      // (B3-2) SET WIDTH/HEIGHT
      percent = Math.ceil((el[1] / largest) * 100) + "%";
      if (hor) { bar.style.width = percent; } else { bar.style.height = percent; }
 
      // (B3-3) BACKGROUND COLOR & TEXT
      bar.style.background = el[2] ? el[2] : bchart.rcolor();
      bar.innerHTML = el[0] + ": " + el[1];
    });
    instance.target.appendChild(bars);
  }
};

// (C) INIT CHART
window.addEventListener("load", () => {
  bchart.draw({
    type : "h",
    target : document.getElementById("demoA"),
    data: [["First", 33], ["Second", 100], ["Third", 70]]
  });
  
  bchart.draw({
    type : "v",
    target : document.getElementById("demoB"),
    data: [
      ["First", 33, "#4e0707"],
      ["Second", 100, "#077419"],
      ["Third", 70, "#124789"]
    ]
  });
});
!
999px

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