css - Pseudoelement RGBA arrow color doesn't match parent -

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i'm creating pseudoelement arrow under div (#telegram-join), both of have background/border colors rgba values (rgba(255, 255, 255, 0.25)), arrow being affected differently , appears darker div. because it's smaller? how can match them? thanks!

html

<div id="telegram-join" class="bg-combo">   <h1><i class="fa fa-telegram"></i> chat on telegram</h1> </div>

css:

.bg-combo {   display: flex;   align-items: center;   justify-content: center;   margin: 0 auto;   border-radius: 8px;   padding: 5px 10px;   width: fit-content;   background-color: white;   background-color: rgba(255, 255, 255, 0.25);   text-align: center; }  .bg-combo h1 {   display: inline-block;   font-size: 2em;   line-height: 1.5;   text-transform: uppercase; } .bg-combo h1 {   margin-right: 10px; }  #telegram-join {   position: relative;   margin: 15px auto 25px; }  #telegram-join :after {   position: absolute;   top: 100%;   left: 50%;   transform: rotate(-45deg);   transform-origin: 50% 50%;   margin-left: -15px;   margin-top: -15px;   border: 15px solid #fff;   width: 0;   height: 0;   border-color: transparent transparent rgba(255, 255, 255, 0.25) rgba(255, 255, 255, 0.25);   content: ''; }

demo: codepen

your background-color (of container) has 0.25% opacity, , pseudo-element (which inside element) has 0.25% opacity (so it's background no longer body-background, it's new background of container element - has opacity).

you can solve setting opacity of pseudo-element 0.125%:

border-color: transparent transparent rgba(255,255,255,0.125) rgba(255,255,255,0.125);

or set background on both elements actual color want:

border-color: transparent transparent #d7d7d7 #d7d7d7;

here update codepen:
https://codepen.io/anon/pen/eexqao





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