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HTML 

              
                <div class="container">
	<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
			<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-YvpcrYf0tY3lHB60NNkmXc5s9fDVZLESaAA55NDzOxhy9GkcIdslK1eN7N6jIeHz" crossorigin="anonymous"></script>
	<div class="row col-12 mx-auto p-0 text-center">
		<h4 class="display-4">
			Jelly Button CSS
		</h4>
	</div>
	<br>
	<div class="jelly-container">
		<!-- Jelly Button Class List -->
		<!--  Small Buttons -->
		<button class="jb-btn jb-s jb-primary">Small Primary</button>
		<button class="jb-btn jb-s jb-secondary">Small Secondary</button>
		<button class="jb-btn jb-s jb-success">Small Success</button>
		<button class="jb-btn jb-s jb-info">Small Info</button>
		<button class="jb-btn jb-s jb-warning">Small Warning</button>
		<button class="jb-btn jb-s jb-danger">Small Danger</button>
		<button class="jb-btn jb-s jb-light">Small Light</button>
		<button class="jb-btn jb-s jb-dark">Small Dark</button>
		<hr>
		<!-- Normal Buttons -->
		<button class="jb-btn jb-n jb-primary">Normal Primary</button>
		<button class="jb-btn jb-n jb-secondary">Normal Secondary</button> 
		<button class="jb-btn jb-n jb-success">Normal Success</button>
		<button class="jb-btn jb-n jb-info">Normal Info</button>
		<button class="jb-btn jb-n jb-warning">Normal Warning</button> 
		<button class="jb-btn jb-n jb-danger">Normal Danger</button>
		<button class="jb-btn jb-n jb-light">Normal Light</button>
		<button class="jb-btn jb-n jb-dark">Normal Dark</button>
		<hr>
		<!--  Large Buttons -->
		<button class="jb-btn jb-l jb-primary">Large Primary</button>
		<button class="jb-btn jb-l jb-secondary">Large Secondary</button>
		<button class="jb-btn jb-l jb-success">Large Success</button>
		<button class="jb-btn jb-l jb-info">Large Info</button>
		<button class="jb-btn jb-l jb-warning">Large Warning</button>
		<button class="jb-btn jb-l jb-danger">Large Danger</button>
		<button class="jb-btn jb-l jb-light">Large Light</button>
		<button class="jb-btn jb-l jb-dark">Large Dark</button>
	</div>
	<hr>
	<div>
		<!-- Default Bootstrap Buttons with jelly button CSS -->
		<h4>Default Bootstrap 5.3 with jelly Button CSS</h4>
		<button type="button" class="btn btn-primary">Primary</button>
		<button type="button" class="btn btn-secondary">Secondary</button>
		<button type="button" class="btn btn-success">Success</button>
		<button type="button" class="btn btn-danger">Danger</button>
		<button type="button" class="btn btn-warning">Warning</button>
		<button type="button" class="btn btn-info">Info</button>
		<button type="button" class="btn btn-light">Light</button>
		<button type="button" class="btn btn-dark">Dark</button>

		<button type="button" class="btn btn-link">Link</button>
	</div>
	<br>
</div>
!

CSS 

              
                /*
 * Enhanced Jelly Button Stylesheet
 * Works with Bootstrap and Links
 * Author: 13Garth
 */

 :root {
    /* Scaled Down Size Variables */

    /* Small Size */
    --jb-padding-s: 0.5em 1em;
    --jb-radius-s: 1rem;
    --jb-font-size-s: 0.875rem;
    --jb-line-height-s: 1.25rem;

    /* Normal Size */
    --jb-padding-n: 0.75em 1.5em;
    --jb-radius-n: 1.5rem;
    --jb-font-size-n: 1rem;
    --jb-line-height-n: 1.5rem;

    /* Large Size */
    --jb-padding-l: 1em 2em;
    --jb-radius-l: 2rem;
    --jb-font-size-l: 1.25rem;
    --jb-line-height-l: 1.75rem;

    --jb-font-weight: 700;

    /* Box Shadow */
    --jb-box-shadow: 0 0.4rem 0.8rem rgba(0, 0, 0, 0.3);

    /* Text */
    --jb-text-color: #ffffff;
    --jb-drop-shadow-color: rgba(0, 0, 0, 0.5);

    /* Variations */
    --jb-primary-bg-start: #1e90ff;
    --jb-primary-bg-end: #104e8b;

    --jb-secondary-bg-start: #6a5acd;
    --jb-secondary-bg-end: #483d8b;

    --jb-success-bg-start: #32cd32;
    --jb-success-bg-end: #228b22;

    --jb-danger-bg-start: #ff4040;
    --jb-danger-bg-end: #b22222;

    --jb-warning-bg-start: #ffd700;
    --jb-warning-bg-end: #daa520;

    --jb-info-bg-start: #ff7f50;
    --jb-info-bg-end: #ff4500;

    --jb-light-bg-start: #f0e68c;
    --jb-light-bg-end: #eee8aa;
    --jb-light-text-color: #000;

    --jb-dark-bg-start: #2f4f4f;
    --jb-dark-bg-end: #000;
  }

  /* Base Jelly Button Styles */
  .jb-btn,
  .btn,
  .jb-link,
  a.jb-btn {
    cursor: pointer;
    position: relative;
    display: inline-block; /* Ensure links behave like buttons */
    border: none;
    border-radius: var(--jb-radius, 1.5rem);
    padding: var(--jb-padding, 0.75em 1.5em);
    font-size: var(--jb-font-size, 1rem);
    line-height: var(--jb-line-height, 1.5rem);
    font-weight: var(--jb-font-weight);
    color: var(--jb-text-color, #fff);
    background: linear-gradient(
      -180deg,
      var(--jb-bg-start, #000) 0%,
      var(--jb-bg-end, #000) 100%
    );
    box-shadow: var(--jb-box-shadow);
    text-decoration: none; /* Remove underline from links */
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    overflow: hidden;
    text-align: center;
    will-change: transform;
    touch-action: manipulation;
    user-select: none;
  }

  .jb-btn:hover,
  .btn:hover,
  .jb-link:hover,
  a.jb-btn:hover {
    animation: jelly 0.5s ease-in-out;
  }

  .jb-btn:active,
  .btn:active,
  .jb-link:active,
  a.jb-btn:active {
    transform: scale(0.95);
    box-shadow: 0 0.2rem 0.4rem rgba(0, 0, 0, 0.4);
  }

  .jb-btn:focus,
  .btn:focus,
  .jb-link:focus,
  a.jb-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.5);
  }

  /* Sizes */
  .jb-s,
  .btn-sm,
  .jb-link-sm,
  a.jb-s {
    --jb-padding: var(--jb-padding-s);
    --jb-radius: var(--jb-radius-s);
    --jb-font-size: var(--jb-font-size-s);
    --jb-line-height: var(--jb-line-height-s);
  }

  .jb-n,
  .btn-md,
  .jb-link-md,
  a.jb-n {
    --jb-padding: var(--jb-padding-n);
    --jb-radius: var(--jb-radius-n);
    --jb-font-size: var(--jb-font-size-n);
    --jb-line-height: var(--jb-line-height-n);
  }

  .jb-l,
  .btn-lg,
  .jb-link-lg,
  a.jb-l {
    --jb-padding: var(--jb-padding-l);
    --jb-radius: var(--jb-radius-l);
    --jb-font-size: var(--jb-font-size-l);
    --jb-line-height: var(--jb-line-height-l);
  }

  /* Variations */
  .jb-primary,
  .btn-primary,
  .jb-link-primary,
  a.jb-primary {
    --jb-bg-start: var(--jb-primary-bg-start);
    --jb-bg-end: var(--jb-primary-bg-end);
  }

  .jb-secondary,
  .btn-secondary,
  .jb-link-secondary,
  a.jb-secondary {
    --jb-bg-start: var(--jb-secondary-bg-start);
    --jb-bg-end: var(--jb-secondary-bg-end);
  }

  .jb-success,
  .btn-success,
  .jb-link-success,
  a.jb-success {
    --jb-bg-start: var(--jb-success-bg-start);
    --jb-bg-end: var(--jb-success-bg-end);
  }

  .jb-danger,
  .btn-danger,
  .jb-link-danger,
  a.jb-danger {
    --jb-bg-start: var(--jb-danger-bg-start);
    --jb-bg-end: var(--jb-danger-bg-end);
  }

  .jb-warning,
  .btn-warning,
  .jb-link-warning,
  a.jb-warning {
    --jb-bg-start: var(--jb-warning-bg-start);
    --jb-bg-end: var(--jb-warning-bg-end);
  }

  .jb-info,
  .btn-info,
  .jb-link-info,
  a.jb-info {
    --jb-bg-start: var(--jb-info-bg-start);
    --jb-bg-end: var(--jb-info-bg-end);
  }

  .jb-light,
  .btn-light,
  .jb-link-light,
  a.jb-light {
    --jb-bg-start: var(--jb-light-bg-start);
    --jb-bg-end: var(--jb-light-bg-end);
    --jb-text-color: var(--jb-light-text-color);
  }

  .jb-dark,
  .btn-dark,
  .jb-link-dark,
  a.jb-dark {
    --jb-bg-start: var(--jb-dark-bg-start);
    --jb-bg-end: var(--jb-dark-bg-end);
  }

  /* Jelly Animation */
  @keyframes jelly {
    0% {
      transform: scale(1, 1);
    }
    25% {
      transform: scale(0.9, 1.1);
    }
    50% {
      transform: scale(1.1, 0.9);
    }
    75% {
      transform: scale(0.95, 1.05);
    }
    100% {
      transform: scale(1, 1);
    }
  }
!

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