Create a glowing effect button using HTML/CSS

This code will generate a button with a glowing effect. Adjust the colors, shadow sizes, and transition durations as needed to achieve the desired glowing effect for your button.

Here’s an example of creating a glowing effect button using HTML and CSS:

HTML

  <button class="btn" type="button">
    <strong>SPACE</strong>
    <div id="container-stars">
      <div id="stars"></div>
    </div>

    <div id="glow">
      <div class="circle"></div>
      <div class="circle"></div>
    </div>
  </button>

CSS

.btn {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 13rem;
  overflow: hidden;
  height: 3rem;
  background-size: 300% 300%;
  backdrop-filter: blur(1rem);
  border-radius: 5rem;
  transition: 0.5s;
  animation: gradient_301 5s ease infinite;
  border: double 4px transparent;
  background-image: linear-gradient(#212121, #212121),  linear-gradient(137.48deg, #ffdb3b 10%,#FE53BB 45%, #8F51EA 67%, #0044ff 87%);
  background-origin: border-box;
  background-clip: content-box, border-box;
}

#container-stars {
  position: absolute;
  z-index: -1;
  width: 100%;
  height: 100%;
  overflow: hidden;
  transition: 0.5s;
  backdrop-filter: blur(1rem);
  border-radius: 5rem;
}

strong {
  z-index: 2;
  font-family: 'Avalors Personal Use';
  font-size: 12px;
  letter-spacing: 5px;
  color: #FFFFFF;
  text-shadow: 0 0 4px white;
}

#glow {
  position: absolute;
  display: flex;
  width: 12rem;
}

.circle {
  width: 100%;
  height: 30px;
  filter: blur(2rem);
  animation: pulse_3011 4s infinite;
  z-index: -1;
}

.circle:nth-of-type(1) {
  background: rgba(254, 83, 186, 0.636);
}

.circle:nth-of-type(2) {
  background: rgba(142, 81, 234, 0.704);
}

.btn:hover #container-stars {
  z-index: 1;
  background-color: #212121;
}

.btn:hover {
  transform: scale(1.1)
}

.btn:active {
  border: double 4px #FE53BB;
  background-origin: border-box;
  background-clip: content-box, border-box;
  animation: none;
}

.btn:active .circle {
  background: #FE53BB;
}

#stars {
  position: relative;
  background: transparent;
  width: 200rem;
  height: 200rem;
}

#stars::after {
  content: "";
  position: absolute;
  top: -10rem;
  left: -100rem;
  width: 100%;
  height: 100%;
  animation: animStarRotate 90s linear infinite;
}

#stars::after {
  background-image: radial-gradient(#ffffff 1px, transparent 1%);
  background-size: 50px 50px;
}

#stars::before {
  content: "";
  position: absolute;
  top: 0;
  left: -50%;
  width: 170%;
  height: 500%;
  animation: animStar 60s linear infinite;
}

#stars::before {
  background-image: radial-gradient(#ffffff 1px, transparent 1%);
  background-size: 50px 50px;
  opacity: 0.5;
}

@keyframes animStar {
  from {
    transform: translateY(0);
  }

  to {
    transform: translateY(-135rem);
  }
}

@keyframes animStarRotate {
  from {
    transform: rotate(360deg);
  }

  to {
    transform: rotate(0);
  }
}

@keyframes gradient_301 {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}

@keyframes pulse_3011 {
  0% {
    transform: scale(0.75);
    box-shadow: 0 0 0 0 rgba(0, 0, 0, 0.7);
  }

  70% {
    transform: scale(1);
    box-shadow: 0 0 0 10px rgba(0, 0, 0, 0);
  }

  100% {
    transform: scale(0.75);
    box-shadow: 0 0 0 0 rgba(0, 0, 0, 0);
  }
}

HTML & CSS

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .btn {
      display: flex;
      justify-content: center;
      align-items: center;
      width: 13rem;
      overflow: hidden;
      height: 3rem;
      background-size: 300% 300%;
      backdrop-filter: blur(1rem);
      border-radius: 5rem;
      transition: 0.5s;
      animation: gradient_301 5s ease infinite;
      border: double 4px transparent;
      background-image: linear-gradient(#212121, #212121), linear-gradient(137.48deg, #ffdb3b 10%, #FE53BB 45%, #8F51EA 67%, #0044ff 87%);
      background-origin: border-box;
      background-clip: content-box, border-box;
    }

    #container-stars {
      position: absolute;
      z-index: -1;
      width: 100%;
      height: 100%;
      overflow: hidden;
      transition: 0.5s;
      backdrop-filter: blur(1rem);
      border-radius: 5rem;
    }

    strong {
      z-index: 2;
      font-family: 'Avalors Personal Use';
      font-size: 12px;
      letter-spacing: 5px;
      color: #FFFFFF;
      text-shadow: 0 0 4px white;
    }

    #glow {
      position: absolute;
      display: flex;
      width: 12rem;
    }

    .circle {
      width: 100%;
      height: 30px;
      filter: blur(2rem);
      animation: pulse_3011 4s infinite;
      z-index: -1;
    }

    .circle:nth-of-type(1) {
      background: rgba(254, 83, 186, 0.636);
    }

    .circle:nth-of-type(2) {
      background: rgba(142, 81, 234, 0.704);
    }

    .btn:hover #container-stars {
      z-index: 1;
      background-color: #212121;
    }

    .btn:hover {
      transform: scale(1.1)
    }

    .btn:active {
      border: double 4px #FE53BB;
      background-origin: border-box;
      background-clip: content-box, border-box;
      animation: none;
    }

    .btn:active .circle {
      background: #FE53BB;
    }

    #stars {
      position: relative;
      background: transparent;
      width: 200rem;
      height: 200rem;
    }

    #stars::after {
      content: "";
      position: absolute;
      top: -10rem;
      left: -100rem;
      width: 100%;
      height: 100%;
      animation: animStarRotate 90s linear infinite;
    }

    #stars::after {
      background-image: radial-gradient(#ffffff 1px, transparent 1%);
      background-size: 50px 50px;
    }

    #stars::before {
      content: "";
      position: absolute;
      top: 0;
      left: -50%;
      width: 170%;
      height: 500%;
      animation: animStar 60s linear infinite;
    }

    #stars::before {
      background-image: radial-gradient(#ffffff 1px, transparent 1%);
      background-size: 50px 50px;
      opacity: 0.5;
    }

    @keyframes animStar {
      from {
        transform: translateY(0);
      }

      to {
        transform: translateY(-135rem);
      }
    }

    @keyframes animStarRotate {
      from {
        transform: rotate(360deg);
      }

      to {
        transform: rotate(0);
      }
    }

    @keyframes gradient_301 {
      0% {
        background-position: 0% 50%;
      }

      50% {
        background-position: 100% 50%;
      }

      100% {
        background-position: 0% 50%;
      }
    }

    @keyframes pulse_3011 {
      0% {
        transform: scale(0.75);
        box-shadow: 0 0 0 0 rgba(0, 0, 0, 0.7);
      }

      70% {
        transform: scale(1);
        box-shadow: 0 0 0 10px rgba(0, 0, 0, 0);
      }

      100% {
        transform: scale(0.75);
        box-shadow: 0 0 0 0 rgba(0, 0, 0, 0);
      }
    }
  </style>
</head>

<body>
  <button class="btn" type="button">
    <strong>SPACE</strong>
    <div id="container-stars">
      <div id="stars"></div>
    </div>

    <div id="glow">
      <div class="circle"></div>
      <div class="circle"></div>
    </div>
  </button>

</body>

</html>

THE END