CSS
#slOverlay {
position: fixed;
top: 0;
right: 0;
width: 100%;
height: 100%;
background: black;
z-index: 99998;
pointer-events: none;
opacity: 0;
-webkit-transition: all 0.5s ease;
transition: all 0.5s ease;
}
.sl-wrap {
display: block;
position: relative;
color: #333;
max-width: 500px;
margin: 30px auto;
text-align: center;
z-index: 9;
}
.sl-opacity-button .sl-icon {
font-size: 0;
position: relative;
}
.sl-opacity-button:hover .sl-icon::after {
content: "";
display: block;
height: 50px;
width: 150%;
position: absolute;
bottom: -25px;
left: -25%;
}
.sl-opacity-button {
cursor: pointer;
}
.sl-opacity-button .sl-icon::before {
content: "";
font-family: 'light-icons';
font-size: 45px;
font-weight: normal !important;
}
.sl-opacity-button:hover::after{
content: "";
display: block;
width: 292px;
position: absolute;
height: 50px;
left: 105px;
bottom: -10px;
cursor: default;
z-index: -1;
}
.sl-selector {
position: absolute;
left: 105px;
top: 100%;
width: 292px;
padding: 10px;
background: #222;
border-radius: 6px;
opacity: 0;
pointer-events: none;
border: 1px outset #222;
box-shadow: 0 3px 5px rgba(0,0,0,0.35);
-webkit-transition: all 0.3s ease;
transition: all 0.3s ease;
}
.sl-selector::before {
content: "";
display: block;
position: absolute;
left: 129px;
top: -30px;
width: 0;
height: 0;
border: 15px solid transparent;
border-bottom-color: #222;
}
.sl-opacity-button:hover .sl-selector {
opacity: 1;
pointer-events: all;
}
.sl-selector button {
cursor: pointer;
background: white;
border: none;
border-right: 1px solid #111;
color: #111;
width: 45px;
font-size: 12px;
font-family: inherit;
padding: 3px;
position: relative;
overflow: hidden;
-webkit-transition: all 0.2s ease;
transition: all 0.2s ease;
}
.sl-selector button:hover {
opacity: 0.9;
transform: translateY(-1px);
box-shadow: 0 2px 2px rgba(0,0,0,0.5);
}
.sl-selector button::before {
content: "";
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
pointer-events: none;
background: black;
opacity: 0;
}
.sl-selector button:first-of-type {
border-radius: 4px 0 0 4px;
}
.sl-selector button:last-of-type {
border-radius: 0 4px 4px 0;
}
.sl-selector > span {
cursor: default;
display: block;
line-height: 1em;
padding-bottom: 2px;
font-size: 12px;
text-align: left;
color: white;
}
.sl-selector #slCurrent {
font-weight: bold;
}
#slLight50::before {opacity: 0.5;}
#slLight60::before {opacity: 0.4;}
#slLight70::before {opacity: 0.3;}
#slLight80::before {opacity: 0.2;}
#slLight90::before {opacity: 0.1;}
JavaScript
const opacityValue = document.cookie.split('; ').find(row => row.startsWith('slOpacity=')).split('=')[1];
window.onload = function() {
if (document.cookie.split(';').some((item) => item.includes('slOpacity='))) {
document.getElementById("slOverlay").style="opacity:"+opacityValue+"%";
var slOpacityBtn = document.getElementsByClassName("sl-opacity-button")[0];
slOpacityBtn.innerHTML+='<div class="sl-selector">
<span>Current Brightness: <span id="slCurrent">100%</span></span>
<button id="slLight100">100%</button>
<button id="slLight90">90%</button>
<button id="slLight80">80%</button>
<button id="slLight70">70%</button>
<button id="slLight60">60%</button>
<button id="slLight50">50%</button>
</div>';
document.getElementById("slLight100").setAttribute("onclick", "setOpacity('slOpacity', '0')");
document.getElementById("slLight90").setAttribute("onclick", "setOpacity('slOpacity', '10')");
document.getElementById("slLight80").setAttribute("onclick", "setOpacity('slOpacity', '20')");
document.getElementById("slLight70").setAttribute("onclick", "setOpacity('slOpacity', '30')");
document.getElementById("slLight60").setAttribute("onclick", "setOpacity('slOpacity', '40')");
document.getElementById("slLight50").setAttribute("onclick", "setOpacity('slOpacity', '50')");
var slCurrentOpacity = document.getElementById("slCurrent");
var slOpacityPercent = 100 - opacityValue;
slCurrentOpacity.innerHTML = slOpacityPercent + "%";
} else {
document.cookie = "slOpacity=0; path=/";
window.location.reload();
}}
function setOpacity(cname,cvalue) {
document.cookie = cname+"="+cvalue+"; path=/";
window.location.reload();
}