have a task in front of me - when changing the slider parameters to change the brightness of the entire page, I tried the option with a full-screen div, but it blocked access to the rest of the elements, I also tried to set the filter parameter for the body, but in this case the page construction went wrong
CodePudding user response：
All you need to do is either use a filter: brightness(..) on <body>, make clever use of your website colors using hsl(..) colors and change their lightness value or a mix of both methods.
All can easily be done with a range slider modifying a single --brightness custom variable with one line of Javascript. Just en/disable the various options as mentioned in the CSS.
Just as a reminder: without a proper minimal reproducible example no one on SO will be able to help you with your specific issue...
I created a small demo showcasing the above:
/*
Custom variable to hold overall brightness percentage
modified with the range slider min [0.25] max [1.75]
default value [1].
Modified with slider "oninput" JS...
*/
html { --brightness: 1 }
.webpage {
margin-top: 3rem;
/* Default color setting */
background-color: hsl(0,0%, 41.2%); color: hsl(0,0%, 100%);
/* Override by changing (L)ightness parameter of HSL color */
background-color: hsl(0,0%, calc(var(--brightness) * 41.2%)); color: hsl(0,0%, calc(var(--brightness) * 100%));
/* disable when using filter */
/* Modify overall brightness */
/* filter: brightness(var(--brightness)); /* enable to see difference with HSL */
/* Modify overall brightness and invert B/W */
/* filter: brightness(var(--brightness)) invert(var(--brightness)); /* enable to see difference with HSL */
}
/* Extras, just to make the demo look good */
/********************************/
/* some convenient global rules */
/********************************/
*, ::before, ::after { box-sizing: border-box }
html, body { width: 100%; max-width: 100% }
html { scroll-behavior: smooth }
body { min-height: 100vh; margin: 0; line-height: 1.5 }
/************************************************/
/* element responsive behavior [STABLE] */
/************************************************/
/* https://codepen.io/renevanderlende/pen/YzEaKvO?editors=1100 */
/* responsive base font size using y = mx b 'y-intercept form' => y = 0.00625x 12 */
html { font-size: calc(0.625vmin 0.75rem) } /* (320,14)(1280,20) */
body { font-size: 1rem; line-height: 1.5 }
/* Generic page spacers, root font size independent, also y = mx bs
T/B: (360,0)(2160, 90) => y = 0.05x - 18 <= base 90, 72 at 1920x1080
L/R: (640,0)(1920,448) => y = 0.35x - 224 <= base 160, 360x640 full screen
*/
:root { --min-pad: 1rem }
[padded] { padding: max(var(--min-pad),calc(5vmin - 18px))
max(var(--min-pad),calc(35vw - 224px)) }
[padded="1"] { padding: var(--min-pad) } /* minimal padding */
[padded="0"] { padding: 0 } /* no padding */
label {
position: fixed; top: 0; width: 100%;
display: inline-flex; flex-direction: column;
background-color: white;
cursor: pointer;
}<label>Brightness <input type="range" min="0.25" max="1.75" value="1" step="0.01"
oninput="javascript:document.documentElement.style.setProperty('--brightness', this.value)"> </label>
<div padded >
<h2>Lorem Ipsum dolor...</h2>
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</p>
<p>
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</p>
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</p>
<p>
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</p>
<p>
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</p>
</div>