a1{
	position: relative;
	padding: 20px 50px;
	text-decoration: none;
	color: #fff;
	font-size: 2em;
	text-transform: uppercase;
	font-family: sans-serif;
	letter-spacing: 4px;
	overflow: hidden;
	background: rgba(255,255,255,.1);
	box-shadow: 0 5px 5px rgba(0,0,0.2);
}
a1:before{
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	width: 50%;
	height: 100%;
	background: rgba(255,255,255,.1);
}
a1:after{
	content: '';
	position: absolute;
	top: 0;
	left: -100%;
	width: 100%;
	height: 100%;
	background: linear-gradient(90deg,transparent,rgba(255,255,255,.4),transparent);
	transition: 0.5s;
	transition-delay: 0.5s;
}
a1:hover:after{
	left: 100%;
}
a1 span{
	position: absolute;
	display: block;
	transition: 0.5s ease;
}
a1 span:nth-child(1)
{
	top: 0;
	left: 0;
	width: 0;
	height: 1px;
	background: #fff;
}
a1:hover span:nth-child(1)
{
	width: 100%;
	transform: translateX(100%);
}
a1 span:nth-child(3)
{
	bottom: 0;
	right: 0;
	width: 0;
	height: 1px;
	background: #fff;
}
a1:hover span:nth-child(3)
{
	width: 100%;
	transform: translateX(-100%);
}
a1 span:nth-child(2)
{
	top: 0;
	left: 0;
	width: 1px;
	height: 0;
	background: #fff;
}
a1:hover span:nth-child(2)
{
	height: 100%;
	transform: translateY(100%);
}
a1 span:nth-child(4)
{
	bottom: 0;
	right: 0;
	width: 1px;
	height: 0;
	background: #fff;
}
a1:hover span:nth-child(4)
{
	height: 100%;
	transform: translateY(-100%);
}


.mouse-cursor-gradient-tracking {
  position: relative;
  background: #7983ff;
  padding: 0.5rem 1rem;
  font-size: 1.2rem;
  border: none;
  color: white;
  cursor: pointer;
  outline: none;
  overflow: hidden;
}

.mouse-cursor-gradient-tracking span {
  position: relative;
}

.mouse-cursor-gradient-tracking:before {
  --size: 0;
  content: '';
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: var(--size);
  height: var(--size);
  background: radial-gradient(circle closest-side, pink, transparent);
  transform: translate(-50%, -50%);
  transition: width 0.2s ease, height 0.2s ease;
}

.mouse-cursor-gradient-tracking:hover:before {
  --size: 200px;
}