@import url('https://fonts.googleapis.com/css2?family=Merriweather:ital@1&family=Oswald:wght@500&display=swap');
@import url('https://pro.fontawesome.com/releases/v6.0.0-beta1/css/all.css');

/* grid layout */
ol, ol::before, ol::after, 
ol *, ol *::before, ol *::after { margin: 0; padding: 0; box-sizing: border-box }
ol { 
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: 1rem;
  
  width: min(60rem, calc(100% - 2rem));
  margin-inline: auto;
  padding-block: 1rem;
  
  list-style: none;
  counter-reset: count;
}

/* card layout/styling */
ol > li {
  --card-background-color: #f0f0f0;
  --card-text-color: #0F0F0F;
  --card-border-radius: 0.5rem;
  --card-padding-block: 1.5rem;
  --card-padding-inline: 1rem;
  
  --outset-size: 0.75rem;
  --outset-background-color: #e5e5e5;
  
  --number-font-size: 3rem;
  --number-overlap: 0.5rem;
  --number-font-family: 'Oswald', sans-serif;
  --number-font-weight: 500;
  
  margin: var(--outset-size);
  margin-top: calc(var(--number-font-size) - var(--number-overlap));
  border-radius: var(--card-border-radius);
  padding-block: var(--card-padding-block);
  padding-inline: var(--card-padding-inline);
  
  color: var(--card-text-color);
  background-color: var(--card-background-color);
  box-shadow: 
    inset 1px 1px 0px rgb(255 255 255 / .5),
    inset -1px -1px 0px rgb(0 0 0 / .25),
    calc(var(--outset-size) * .25) calc(var(--outset-size) * .25) calc(var(--outset-size) * .5) rgb(0 0 0 / .25);
  position: relative;
  counter-increment: count;
}

ol > li::after{
  content: counter(count, decimal-leading-zero);
  position: absolute;
  
  bottom: calc(100% - var(--number-overlap));
  left: 50%;
  transform: translateX(-50%);
  
  color: var(--accent-color);
  font-family: var(--number-font-family);
  font-weight: var(--number-font-weight);
  font-size: var(--number-font-size);
  line-height: 1;
  z-index: -1;
}
ol > li::before{
  content: "";
  position: absolute;
  width: calc(100% + (var(--outset-size) * 2));
  height: 100%;
  bottom: calc(var(--outset-size) * -1);
  left: calc(var(--outset-size) * -1);
  z-index: -1;
  
  border-bottom-left-radius: calc(var(--card-border-radius) + var(--outset-size));
  border-bottom-right-radius: calc(var(--card-border-radius) + var(--outset-size));
  
  background-color: var(--outset-background-color);
  
  background-image: 
    linear-gradient(to left, var(--outset-background-color) calc(var(--outset-size) * 2), transparent 0),
    linear-gradient(135deg, var(--accent-color) 80%, var(--outset-background-color) 0);    
}

/* card content */
h1 {
  font-size: 2.5rem;
  font-family: 'Oswald', sans-serif;
  text-align: center;
  font-weight: normal
}
.icon{
  font-size: 2rem;
  text-align: center;
  margin-bottom: calc(var(--card-padding-block) * .5);
}
.title {
  text-transform: uppercase;
  font-family: 'Oswald', sans-serif;
  text-align: center;
  color: var(--accent-color)
}
.descr {
  color: var(--text-color);
  font-size: 0.75rem;
  font-family: 'Merriweather', serif;
  text-align: center;
}

/*  */
body {
  background-color: #f5f5f5;
  min-height: 100vh;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
-----
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    background: #000;
}

.glow-on-hover {
    width: 220px;
    height: 50px;
    border: none;
    outline: none;
    color: #fff;
    background: #111;
    cursor: pointer;
    position: relative;
    z-index: 0;
    border-radius: 10px;
}

.glow-on-hover:before {
    content: '';
    background: linear-gradient(45deg, #ff0000, #ff7300, #fffb00, #48ff00, #00ffd5, #002bff, #7a00ff, #ff00c8, #ff0000);
    position: absolute;
    top: -2px;
    left:-2px;
    background-size: 400%;
    z-index: -1;
    filter: blur(5px);
    width: calc(100% + 4px);
    height: calc(100% + 4px);
    animation: glowing 20s linear infinite;
    opacity: 0;
    transition: opacity .3s ease-in-out;
    border-radius: 10px;
}

.glow-on-hover:active {
    color: #000
}

.glow-on-hover:active:after {
    background: transparent;
}

.glow-on-hover:hover:before {
    opacity: 1;
}

.glow-on-hover:after {
    z-index: -1;
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: #111;
    left: 0;
    top: 0;
    border-radius: 10px;
}

@keyframes glowing {
    0% { background-position: 0 0; }
    50% { background-position: 400% 0; }
    100% { background-position: 0 0; }
}
---