<div class="btn from-top">From Top</div>
<div class="btn from-left">From Left</div>
<div class="btn from-right">From Right</div>
<div class="btn from-center">From Center</div>
<div class="btn from-bottom">From Bottom</div>

/* ~~~~~~~ INIT. BTN ~~~~~~~ */

.btn {    
  position: relative; 
  padding: 1.4rem 4.2rem;
  padding-right: 3.1rem;
  font-size: 1.4rem;
  color: var(--inv);
  letter-spacing: 1.1rem;
  text-transform: uppercase;
  transition: all 500ms cubic-bezier(0.77, 0, 0.175, 1);  
  cursor: pointer;
  user-select: none;
}

.btn:before, .btn:after {
  content: '';
  position: absolute; 
  transition: inherit;
  z-index: -1;
}

.btn:hover {
  color: var(--def);
  transition-delay: .5s;
}

.btn:hover:before {
  transition-delay: 0s;
}

.btn:hover:after {
  background: var(--inv);
  transition-delay: .35s;
}

/* From Top */

.from-top:before, 
.from-top:after {
  left: 0;
  height: 0;
  width: 100%;
}

.from-top:before {
  bottom: 0;  
  border: 1px solid var(--inv);
  border-top: 0;
  border-bottom: 0;
}

.from-top:after {
  top: 0;
  height: 0;
}

.from-top:hover:before,
.from-top:hover:after {
  height: 100%;
}

/* From Left */

.from-left:before, 
.from-left:after {
  top: 0;
  width: 0;
  height: 100%;
}

.from-left:before {
  right: 0;
  border: 1px solid var(--inv);
  border-left: 0;
  border-right: 0;  
}

.from-left:after {
  left: 0;
}

.from-left:hover:before,
.from-left:hover:after {
  width: 100%;
}

/* From Right */

.from-right:before, 
.from-right:after {
  top: 0;
  width: 0;
  height: 100%;
}

.from-right:before {
  left: 0;
  border: 1px solid var(--inv);
  border-left: 0;
  border-right: 0;  
}

.from-right:after {
  right: 0;
}

.from-right:hover:before,
.from-right:hover:after {
  width: 100%;
}

/* From center */

.from-center:before {
  top: 0;
  left: 50%;
  height: 100%;
  width: 0;
  border: 1px solid var(--inv);
  border-left: 0;
  border-right: 0;
}

.from-center:after {
  bottom: 0;
  left: 0;
  height: 0;
  width: 100%;
  background: var(--inv);
}

.from-center:hover:before {
  left: 0;
  width: 100%;
}

.from-center:hover:after {
  top: 0;
  height: 100%;
}

/* From Bottom */

.from-bottom:before, 
.from-bottom:after {
  left: 0;
  height: 0;
  width: 100%;
}

.from-bottom:before {
  top: 0; 
  border: 1px solid var(--inv);
  border-top: 0;
  border-bottom: 0;
}

.from-bottom:after {
  bottom: 0;
  height: 0;
}

.from-bottom:hover:before,
.from-bottom:hover:after {
  height: 100%;
}


/* ~~~~~~~~~~~~ GLOBAL SETTINGS ~~~~~~~~~~~~ */

*, *:before, *:after {
  box-sizing: border-box;
}

body {
  --def: #96B7C4;   
  --inv: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  height: 100vh;
  width: 100%;
  background-image: linear-gradient(-25deg, #616161 0%, #96B7C4 100%);
}

html {
  font-size: 12px;
  font-family: 'Playfair Display', serif;
}

div {margin-bottom: 3rem;}
div:last-child {margin-bottom: 0;}