Achieve test

by Oleh Kotsubko

HTML

<button id="open-modal">Click me</button>
<div class="modal">
  <button class="close" id="close-modal">
    <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYCAYAAADgdz34AAAACXBIWXMAAAsTAAALEwEAmpwYAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAADoSURBVHgB7ZTNDYMwDIWfYYGOkBU6AptU6gKcKnWCHnphgUrdpKtkBBYA6lRFMlF+bM68CyS23xcRG+BQRSQX1/75ARY3Yerew93DoEv/cC1arsf4Gm7ndb+RSQub8+OXGAqglDB37HGSsQ1g5pMvgLdAInM/Y+5knFIFDRdwwPHSlz5XyjzOpVxhDaIxzwJqEK15EZCDhH2teRWQgvy3VeYqQAICrXlQA6Vo8646lw4QX6h1TqqXnBoi7ZwUAaVWtAwjWc1ljgZCe8wtENprroVsushqHhRy4r+wjMdtOlrMM5ARhyz6Ahxl/J12cQtWAAAAAElFTkSuQmCC" alt="">
  </button>
  <h1 class="modal__title">Открыта ачивка</h1>
  <div class="achieve">
    <div class="wrapper">
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span class="particles-circle"></span>
      <span...

SCSS

.modal {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -60%);
  background: #010E28;
  border: 1px solid rgba(255, 255, 255, 0.24);
  box-sizing: border-box;
  border-radius: 4px;
  color: #fff;
  font-family: sans-serif;
  padding: 64px 48px 38px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease-in-out;
  width: 440px;
  text-align: center;
  
  &__title {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease-in-out;
    transition-delay: 0.2s;
    font-weight: bold;
    font-size: 24px;
    line-height: 32px;
    margin-bottom: 24px;
    margin-top: 0;
    
    &.second {
      transition-delay: 0.6s;
    }
  }
  
  &.is-shown {
    transform: translate(-50%, -50%);
    opacity: 1;
    visibility: visible;
  }
}

.close {
  position: absolute;
  top: 24px;
  right: 24px;
  border: none;
  background-color: transparent;
  cursor: pointer;
  outline: none !important;
  
  img {
    pointer-events: none;
  }
}

.achieve {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.wrapper {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}


.circle {
  position: relative;
  width: 100px;
  height: 100px;
  border: 5px solid #3BBBE9;
  border-radius: 50%;
  overflow: hidden;
  z-index: 1;
  margin-bottom: 24px;
}

.particle {
  position: absolute;
  
  &.head {
    bottom: 18px;
    left: 12px;
    z-index: 2;
  }
  
  &.body {
    bottom: -4px;
    left: 2px;
  }
}

.tail {
  position: absolute;
  top: -13px;
  left: -9px;
}

$theme: #3BBBE9;
$speed: 1.5s; 

.particles-circle {
  position: absolute;
  background-color: $theme; 
  width: 30px;
  height: 30px;
  top: 10px;
  left: 50%;
  margin-left: -15px;
  z-index: -1;
  border-radius: 50%;
  transform: scale(0); 
  visibility: hidden; 

  &:nth-of-type(odd) {
    border: solid 2px $theme;
    background-color: transparent;
  }  
}

.is-shown {
  
  .modal__title {
   ...

JavaScript

document.getElementById('open-modal').addEventListener('click',() => {
	document.querySelector('.modal').classList.toggle('is-shown')
} );

//close
document.getElementById('close-modal').addEventListener('click',() => {
	document.querySelector('.modal').classList.remove('is-shown')
} )