main.css

* {
  font-family: 'Roboto Mono', monospace;
}
.centre-content {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    min-width: 100vw;
    background-color: #141414;
}

.focus-in-expand {
	-webkit-animation: focus-in-expand 0.8s cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
	        animation: focus-in-expand 0.8s cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
}

.glow-on-hover {
  width: 220px;
  font-size: 18px;
  height: 50px;
  border: none;
  outline: none;
  color: #fff;
  background: #111;
  cursor: pointer;
  position: relative;
  z-index: 0;
  border-radius: 10px;
  border: 2px solid white;
}

.glow-on-hover:before {
  content: '';
  background: linear-gradient(45deg, #9DFE78, #78FFC0, #7CFC00, #3CB371, #006400);
  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; */
  color: white;
}

.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; }
}

/* ----------------------------------------------
 * Generated by Animista on 2023-7-8 16:10:41
 * Licensed under FreeBSD License.
 * See http://animista.net/license for more info.
 * w: http://animista.net, t: @cssanimista
 * ---------------------------------------------- */

/**
 * ----------------------------------------
 * animation focus-in-expand
 * ----------------------------------------
 */
 @-webkit-keyframes focus-in-expand {
    0% {
      letter-spacing: -0.5em;
      -webkit-filter: blur(12px);
              filter: blur(12px);
      opacity: 0;
    }
    100% {
      -webkit-filter: blur(0px);
              filter: blur(0px);
      opacity: 1;
    }
  }
  @keyframes focus-in-expand {
    0% {
      letter-spacing: -0.5em;
      -webkit-filter: blur(12px);
              filter: blur(12px);
      opacity: 0;
    }
    100% {
      -webkit-filter: blur(0px);
              filter: blur(0px);
      opacity: 1;
    }
  }