<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Slack Logo</title>
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <div class="slack">
    <div class="blue small"></div>
    <div class="blue big"></div>
    <div class="green small"></div>
    <div class="green big"></div>
    <div class="red small"></div>
    <div class="red big"></div>
    <div class="yellow small"></div>
    <div class="yellow big"></div>
  </div>
  <div class="footer"><p>Created by <a href="https://www.rembertdesigns.co/" target="_blank">Richard Rembert</a></p>
  </div>
</body>
</html>
:root{
    --blue:  #36c5f0;
    --green: #2eb67d;
    --red:   #e01e5a;
    --yellow:#ecb22e;
    --bg:    #4a154b;
}
body{
    display: flex;
    min-height: 100vh;
    justify-content: center;
    align-items: center;
    background: var(--bg);
}
.slack{
    display: grid;
    width: 16rem;
    height: 16rem;
    gap: 0.5rem;
}
.blue{
    background: var(--blue);
}
.blue.small{
    grid-column-start: 2;
    border-bottom-right-radius: 0;
}
.blue.big{
    grid-row: 2;
    grid-column: span 2;
}
.green{
    background: var(--green);
}
.green.small{
    grid-row: 2;
    grid-column-start: 4;
    border-bottom-left-radius: 0;
}
.green.big{
    grid-row: span 2;
    grid-column: 3;
}
.red{
    background: var(--red);
}
.red.small{
    grid-column-start: 1;
    border-top-right-radius: 0;
}
.red.big{
    grid-row: span 2;
    grid-column: 2;
}
.yellow{
    background: var(--yellow);
}
.yellow.small{
    grid-column-start: 3;
    border-top-left-radius: 0;
}
.yellow.big{
    grid-row: 3;
    grid-column: 3/span 2;
}
.slack>div{
    border-radius: 30px;
}
.footer {
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    padding: 1rem;
    background-color: #4a154b;
    text-align: center;
  }
  .footer p {
  text-decoration: none;
  color: #fff;
  }
  .footer a {
    text-decoration: none;
    color: #36c5f0;
  }
  .footer a:hover {
    text-decoration: underline;
    color: #ecb22e;
  }

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.