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HTML 

              
                <div class="buttons">
        <a href="#" class="moody">Moody Button</a>
        <a href="#" class="dashing">😎 Dashing Button</a>
        <button class="crispy">Crispy Button</button>
      </div>
<div class="buttons">
        <a href="#" class="moody-fill">Moody Button</a>
        <a href="#" class="dashing-fill">😎 Dashing Button</a>
        <button class="crispy-fill">Crispy Button</button>
      </div>

<!-- Credit -->
<a class="credit" href="https://www.iamsajid.com/">Sajid</a>
!

CSS 

              
                /* Colors & fonts variables */
/* You just have to look at the Actual code */

@import url("https://fonts.googleapis.com/css2?family=Montserrat:wght@400;700&display=swap");
:root{
  --ff: "Montserrat", sans-serif;
  --colorp: #f9f9f9;
  --colorp2: #fff;
  --colora: #ffe537;
  --colora2: #537fe7;
  --colorbody: #1e1e1e;
  --colors: #333;
  --h1: bold 54px/60px var(--ff);
  --h2: bold 36px/48px var(--ff);
  --h3: bold 24px/36px var(--ff);
  --links: 18px/18px var(--ff);
  --p: 18px/30px var(--ff);
  --p1: 24px/30px var(--ff);
  --p2: 36px/48px var(--ff);
  --subtext: 12px/20px var(--ff);
  --transition: 0.3s ease-in-out;
}
body {
  width: 90%;
  margin: 20px auto;
  max-width: 1080px;
  background-color: var(--colorbody);
  color: var(--colorp);
}

/* Actual code */
.buttons {
  display: flex;
  margin: 100px auto;
  justify-content: space-between;
  gap: 40px;
  align-items: center;
  flex-wrap: wrap;
}

/* Repeating code */
.buttons > *{
  cursor: pointer;
  background: var(--colorbody);
  text-decoration: none;
  font: var(--links);
  padding: 12px 20px;
  border-radius: 8px;
  color: var(--colora);
  transition: var(--transition);
  }
.buttons > *:hover{
  transition: var(--transition);
  }

/* moody */
.moody{
  box-shadow: 0 0 16px var(--colora);
}
.moody:hover {
  box-shadow: 0 0 24px var(--colora);
}
.moody-fill{
  box-shadow: 0 0 16px var(--colora);
  background: var(--colora);
  color: var(--colorbody);
}
.moody-fill:hover {
  box-shadow: 0 0 24px var(--colora);
}

/* dashing */
.dashing{
  background: linear-gradient(var(--colorbody), var(--colorbody)) padding-box,
    linear-gradient(45deg, var(--colora) 0%, var(--colora2) 100%) border-box;
  border: solid 2px transparent;
}
.dashing:hover {
  border: solid 2px var(--colorp);
}

.dashing-fill{
  color: var(--colorbody);
  background: linear-gradient(
    270deg,
    var(--colora),
    var(--colora2),
    var(--colora),
    var(--colora2)
  );
  background-size: 300% 300%;
  animation: bg 10s ease-in-out infinite;
}@keyframes bg {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 100%;
  }
  100% {
    background-position: 0% 50%;
  }
}
.dashing-fill:hover {
  animation: bg 2s ease-in-out infinite;
}

/* crispy */
.crispy{
   border: solid 1px var(--colora);
   box-shadow: 0 2px var(--colora);
}
.crispy:hover {
  box-shadow: 0 4px var(--colora);
}
.crispy-fill{
  background: var(--colora2);
  color: var(--colorp);
  border: solid 1px var(--colorp);
  box-shadow: 0 2px var(--colorp);
}
.crispy-fill:hover {
  box-shadow: 0 4px var(--colorp);
}


















/* Credit */
.credit {
  text-decoration: none;
  position: fixed;
  bottom: 20px;
  right: 5vw;
  background: var(--colors);
  padding: 4px 20px;
  border-radius: 4px;
  font: var(--p);
  color: var(--colorp);
}

.credit:hover {
  color: var(--colora);
  transition: var(--transition);
}
!

JS
!
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