How to create the mechanics and appearance of the zoom effect used in the Reveal.js framework?

Question

Example: Zoom of the Reveal
Goal: Study the mechanics and appearance of Zoom with the best algorithmic solutions.

- Of the problem of appearance:
1 - When inspecting the tag < Section > looking for the background black color pattern
(background detail >> lightly white circles in the center) it presents a different color in the inspection (pink(background: #ff5e99;)) than shown in the slide.

- Of the problem of mechanics:
1 - Make the central text receive a zoom effect that exceeds the screen limits.
2 - The text becomes opaque as it moves away from the center of the screen.

Update 1

div {
  width: 100px;
  height: 100px;
  border: 1px solid black;
  margin-left: 200px;
  margin-top: 50px;
  -webkit-animation-name: zoom;
  -webkit-animation-duration: 350ms;
  -webkit-transform: translate(150%, 150%);
  -webkit-transform: scale(1.1, 1);
  -webkit-transition: translate 2s;
  animation-name: zoom;
  animation-duration: 550ms;
  transform: translate(150%, 150%);
  transform: scale(1.1, 1);
  transition: translate 2s;
  -ms-transform: scale(1.1, 1);
}

@keyframes zoom {
  from {
    opacity: 1;
    -webkit-transform: scale3d(0.7, 0.7, 0.7);
    transform: scale3d(1, 1, 1);
  }
  10% {
    opacity: 0.5;
  }
  100% {
    opacity: 0;
    margin-left: 200px;
    margin-top: 50px;
    visibility: hidden;
  }
}

.zoom {
  -webkit-animation-name: zoom;
  animation-name: zoom;
}

<div>Test</div>

Answer 1

As I told you this is a very basic example, I did a bit of a rush, but I think it will open your head to see that only with CSS you get something very close to this. Calmly and a few more lines of code you manage to adapt in your project. Logically it would only be feasible for something small, a few pages. But it’s a start for you to test the possibilities.

The techniques used are basically, scale(), blur(), opacity, and a checkbox to pass the slide, but depending on a radio buttom be better. Here is an example of slide only with CSS that I did in other reply tb only with CSS: Vertical scroll by sections (like a slide)

See how the result turned out:

html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}
input {
    display: none;
}
.slide {
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    background-image: radial-gradient(circle, #999, #000);
    background-repeat: no-repeat;
    background-size: cover;
}
.slide label {
    border-top: 50px solid rgba(255,255,255,0.5);
    border-bottom: 50px solid transparent;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    position: absolute;
    bottom: 0px;
    right: 20px;
    cursor: pointer;
}
.slide label:hover {
    border-top: 50px solid #fff;
}
.efeito {
    font-family: sans-serif;
    font-size: 8vw;
    color: #fff;
    opacity: 1;
    filter: none;
}
@keyframes testex {
    0% {
        transform: scale(1);
        opacity: 1;
        filter: none;
    }
    99% {
        transform: scale(20);
        opacity: 0;
        filter: blur(5px);
    }
    100% {
        transform: scale(20);
        opacity: 0;
        filter: blur(5px);
        display: none;
        z-index: -999;
    }
}
#bn1:checked ~ #sn1 {
    animation: testex 1s forwards;
}

#sn2 {
    opacity: 0;
    transition: all 1s;
}

#bn1:checked ~ #sn2 {
    opacity: 1;
}

<input type="checkbox" name="" id="bn1">

<section class="slide" id="sn1">
    <label for="bn1"></label>
    <div class="efeito">
        <span>1 texto 123</span>
    </div>
</section>

<section class="slide" id="sn2">
    <label for="bn1"></label>
    <div class="efeito">
        <span>2 texto 456</span>
    </div>
</section>