CSS Properties: How to set the opacity level for a division element

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HTML Code:

<!DOCTYPE html>
<title>How to set the opacity level for a division element</title>
<style type="text/css">
div { 
  background-color: #33C3FF;
.heavy {
  opacity: 0.9; 
<p>w3resource Tutorial</p>
<div class="heavy">The text and the background-color, both are affected by the opacity level but this is very easy to see.</div>

Live Demo:

See the Pen opacity-answer by w3resource (@w3resource) on CodePen.

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HTML-CSS: Tips of the Day

Remove the arrows from input[type="number"] in Opera

CSS Code:

input[type=number]::-webkit-outer-spin-button { 
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    margin: 0; 

HTML Code:

<input type="number" step="0.01"/> 

Ref: https://bit.ly/2JIYZIU


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