CodePen Embed - Buttons. CSS Hover

<h1>CSS buttons hover effects</h1>
<div class="btn-holder">
  <button class="btn btn-1 hover-filled-slide-down">
    <span>hover me</span>
  </button>
  <button class="btn btn-1 hover-filled-slide-up">
    <span>hover me</span>
  </button>
  <button class="btn btn-1 hover-filled-slide-left">
    <span>hover me</span>
  </button>
  <button class="btn btn-1 hover-filled-slide-right">
    <span>hover me</span>
  </button>
  <button class="btn btn-1 hover-filled-opacity">
    <span>hover me</span>
  </button>
</div>
<div class="btn-holder">
  <button class="btn btn-2 hover-slide-down">
    <span>hover me</span>
  </button>
  <button class="btn btn-2 hover-slide-up">
    <span>hover me</span>
  </button>
  <button class="btn btn-2 hover-slide-left">
    <span>hover me</span>
  </button>
  <button class="btn btn-2 hover-slide-right">
    <span>hover me</span>
  </button>
  <button class="btn btn-2 hover-opacity">
    <span>hover me</span>
  </button>
</div>
<div class='btn-holder'>
  <button class="btn btn-3 hover-border-1">
    <span>hover me</span>
  </button>
  <button class="btn btn-3 hover-border-2">
    <span>hover me</span>
  </button>
  <button class="btn btn-3 hover-border-3">
    <span>hover me</span>
  </button>
  <button class="btn btn-3 hover-border-4">
    <span>hover me</span>
  </button>
  <button class="btn btn-3 hover-border-5">
    <span>hover me</span>
  </button>
</div>
<div class="btn-holder">
  <button class="btn btn-4 hover-border-6">
    <span>hover me</span>
  </button>
  <button class="btn btn-4 hover-border-7">
    <span>hover me</span>
  </button>
  <button class="btn btn-4 hover-border-8">
    <span>hover me</span>
  </button>
  <button class="btn btn-4 hover-border-9">
    <span>hover me</span>
  </button>
  <button class="btn btn-4 hover-border-10">
    <span>hover me</span>
  </button>
</div>
<div class="btn-holder">
  <button class="btn btn-5 hover-border-11">
    <span>hover me</span>
  </button>
</div>

* {
  box-sizing: border-box;
  margin: 0; padding: 0;
}
body {
  font-family: 'Roboto', sans-serif;
  color: rgb(85,75,85);
  background-color: rgb(255,255,255);
}
h1 {
  padding: 50px 0;
  font-size: 45px;
  text-align: center;
  color: rgb(54, 56, 55);
}
:active, :hover, :focus {
  outline: 0!important;
  outline-offset: 0;
}
::before,
::after {
  position: absolute;
  content: "";
}

.btn-holder {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  max-width: 1000px;
  margin: 10px auto 35px;
}
.btn {
  position: relative;
  display: inline-block;
  width: auto; height: auto;
  background-color: transparent;
  border: none;
  cursor: pointer;
  margin: 0px 25px 15px;
  min-width: 150px;
}
  .btn span {         
    position: relative;
    display: inline-block;
    font-size: 14px;
    font-weight: bold;
    letter-spacing: 2px;
    text-transform: uppercase;
    top: 0; left: 0;
    width: 100%;
    padding: 15px 20px;
    transition: 0.3s;
  }

/*--- btn-1 ---*/
.btn-1::before {
  background-color: rgb(28, 31, 30);
  transition: 0.3s ease-out;
}
.btn-1 span {
  color: rgb(255,255,255);
  border: 1px solid rgb(28, 31, 30);
  transition: 0.2s 0.1s;
}
.btn-1 span:hover {
  color: rgb(28, 31, 30);
  transition: 0.2s 0.1s;
}

/* 1.hover-filled-slide-down */
.btn.hover-filled-slide-down::before {
  bottom: 0; left: 0; right: 0; 
  height: 100%; width: 100%;
}
.btn.hover-filled-slide-down:hover::before {
  height: 0%;
}

/* 2.hover-filled-slide-up */
.btn.hover-filled-slide-up::before {
  top: 0; left: 0; right: 0;
  height: 100%; width: 100%;
}
.btn.hover-filled-slide-up:hover::before {
  height: 0%;
}

/* 3.hover-filled-slide-left */
.btn.hover-filled-slide-left::before {
  top: 0; bottom: 0; left: 0;
  height: 100%; width: 100%;
}
.btn.hover-filled-slide-left:hover::before {
  width: 0%;
}

/* 4. hover-filled-slide-right */
.btn.hover-filled-slide-right::before {
  top:0; bottom: 0; right: 0;
  height: 100%; width: 100%;
}
.btn.hover-filled-slide-right:hover::before {
  width: 0%;
}

/* 5. hover-filled-opacity */
.btn.hover-filled-opacity::before {
  top:0; bottom: 0; right: 0;
  height: 100%; width: 100%;
  opacity: 1;
}
.btn.hover-filled-opacity:hover::before {
  opacity: 0;
}

/*--- btn-2 ---*/
.btn-2::before {
  background-color: rgb(28, 31, 30);
  transition: 0.3s ease-out;
}
.btn-2 span {
  color: rgb(28, 31, 30);
  border: 1px solid rgb(28, 31, 30);
  transition: 0.2s;
}  
.btn-2 span:hover {
  color: rgb(255,255,255);
  transition: 0.2s 0.1s;
}

/* 6. hover-slide-down */
.btn.hover-slide-down::before {
  top: 0; left: 0; right: 0; 
  height: 0%; width: 100%;
}
.btn.hover-slide-down:hover::before {
  height: 100%;
}

/* 7. hover-slide-up */
.btn.hover-slide-up::before {
  bottom: 0; left: 0; right: 0; 
  height: 0%; width: 100%;
}
.btn.hover-slide-up:hover::before {
  height: 100%;
}

/* 8. hover-slide-left */
.btn.hover-slide-left::before {
  top: 0; bottom: 0; right: 0; 
  height: 100%; width: 0%;
}
.btn.hover-slide-left:hover::before {
  width: 100%;
}

/* 9. hover-slide-right */
.btn.hover-slide-right::before {
  top: 0; bottom: 0; left: 0; 
  height: 100%; width: 0%;
}
.btn.hover-slide-right:hover::before {
  width: 100%;
}

/* 10. hover-opacity */
.btn.hover-opacity::before {
  top:0; bottom: 0; right: 0;
  height: 100%; width: 100%;
  opacity: 0;
}
.btn.hover-opacity:hover::before {
  opacity: 1;
}

/*--- btn-3 ---*/
.btn-3 {
  padding: 5px;
}
.btn-3 span {
  color: rgb(255, 255, 255);
  background-color: rgb(54, 56, 55);
}
.btn-3::before,
.btn-3::after {
  background: transparent;
  z-index: 2;
}

/* 11. hover-border-1 */
.btn.hover-border-1::before,
.btn.hover-border-1::after {
  width: 10%; height: 25%;
  transition: 0.35s;
}
.btn.hover-border-1::before {
  top: 0; left: 0;
  border-left: 1px solid rgb(28, 31, 30);
  border-top: 1px solid rgb(28, 31, 30);
}
.btn.hover-border-1::after {
  bottom: 0; right: 0;
  border-right: 1px solid rgb(28, 31, 30);
  border-bottom: 1px solid rgb(28, 31, 30);
}
.btn.hover-border-1:hover::before,
.btn.hover-border-1:hover::after {
  width: 99%;
  height: 98%;
}

/* 12. hover-border-2 */
.btn.hover-border-2::before,
.btn.hover-border-2::after {
  width: 10%; height: 25%;
  transition: 0.35s;
}
.btn.hover-border-2::before {
  bottom: 0; left: 0;
  border-left: 1px solid rgb(28, 31, 30);
  border-bottom: 1px solid rgb(28, 31, 30);
}
.btn.hover-border-2::after {
  top: 0; right: 0;
  border-right: 1px solid rgb(28, 31, 30);
  border-top: 1px solid rgb(28, 31, 30);
}
.btn.hover-border-2:hover::before,
.btn.hover-border-2:hover::after {
  width: 99%;
  height: 99%;
}

/* 13. hover-border-3 */
.btn.hover-border-3::before,
.btn.hover-border-3::after {
  width: 0%; height: 0%;
  opacity: 0;
  transition: width 0.2s 0.15s linear, height 0.15s linear, opacity 0s 0.35s;
}
.btn.hover-border-3::before {
  top: 0; right: 0;
  border-top: 1px solid rgb(28, 31, 30);
  border-left: 1px solid rgb(28, 31, 30);
}
.btn.hover-border-3::after {
  bottom: 0; left: 0;
  border-bottom: 1px solid rgb(28, 31, 30);
  border-right: 1px solid rgb(28, 31, 30);
}
.btn.hover-border-3:hover::before,
.btn.hover-border-3:hover::after {
  width: 100%; height: 99%;
  opacity: 1;
  transition: width 0.2s linear, height 0.15s 0.2s linear, opacity 0s;   
}

/* 14. hover-border-4 */
.btn.hover-border-4::before,
.btn.hover-border-4::after {
  width: 0%; height: 0%;
  opacity: 0;
  transition: width 0.2s linear, height 0.15s 0.2s ease-out, opacity 0s 0.35s;
}
.btn.hover-border-4::before {
  bottom: 0; left: -1px;
  border-top: 1px solid rgb(28, 31, 30);
  border-left: 1px solid rgb(28, 31, 30);
}
.btn.hover-border-4::after {
  top: 0; right: 0;
  border-bottom: 1px solid rgb(28, 31, 30);
  border-right: 1px solid rgb(28, 31, 30);
}
.btn.hover-border-4:hover::before,
.btn.hover-border-4:hover::after {
  width: 100%; height: 99%;
  opacity: 1;
  transition: width 0.2s 0.15s ease-out, height 0.15s ease-in, opacity 0s;   
}

/* 15. hover-border-5 */
.btn.hover-border-5::before,
.btn.hover-border-5::after {
  width: 0%; height: 0%;
  opacity: 0;
}
.btn.hover-border-5::before {
  top: 0; right: 0;
  border-top: 1px solid rgb(28, 31, 30);
  border-left: 1px solid rgb(28, 31, 30);
  transition: width 0.2s 0.5s ease-out, height 0.15s 0.35s linear, opacity 0s 0.7s;
}
.btn.hover-border-5::after {
  bottom: 0; left: 0px;
  border-bottom: 1px solid rgb(28, 31, 30);
  border-right: 1px solid rgb(28, 31, 30);
  transition: width 0.2s 0.15s linear, height 0.15s ease-in, opacity 0s 0.35s;
}
.btn.hover-border-5:hover::before,
.btn.hover-border-5:hover::after {
  width: 100%; height: 96%;
  opacity: 1;
}
.btn.hover-border-5:hover::before {
  transition: width 0.2s ease-in, height 0.15s 0.2s linear, opacity 0s;   /* 1,2 */
}
.btn.hover-border-5:hover::after {
  transition: width 0.2s 0.35s linear, height 0.15s 0.5s ease-out, opacity 0s 0.3s; 
} 

/*--- btn-4 ---*/
.btn-4 span {
  color: rgb(28, 31, 30);
  background-color: rgb(245,245,245);
}
.btn-4 span:hover {
  color: rgb(54, 56, 55);
}
.btn-4::before,
.btn-4::after {
  width: 15%; height: 2px;
  background-color: rgb(54, 56, 55);
  z-index: 2;
}

/* 16. hover-border-6 */
.btn.hover-border-6::before,
.btn.hover-border-6::after {
  top: 0;
  transition: width 0.2s 0.35s ease-out;
}
.btn.hover-border-6::before {
  right: 50%;
}
.btn.hover-border-6::after {
  left: 50%;
}
.btn.hover-border-6:hover::before,
.btn.hover-border-6:hover::after {
  width: 50%;
  transition: width 0.2s ease-in;   
}

.btn.hover-border-6 span::before,
.btn.hover-border-6 span::after {
  width: 0%; height: 0%;
  background: transparent;
  opacity: 0;
  z-index: 2;
  transition: width 0.2s ease-in, height 0.15s 0.2s linear, opacity 0s 0.35s;
}
.btn.hover-border-6 span::before {
  top: 0; left: 0;
  border-left: 2px solid rgb(54, 56, 55);
  border-bottom: 2px solid rgb(54, 56, 55);
}
.btn.hover-border-6 span::after {
  top: 0; right: 0;
  border-right: 2px solid rgb(54, 56, 55);
  border-bottom: 2px solid rgb(54, 56, 55);
}
.btn.hover-border-6 span:hover::before,
.btn.hover-border-6 span:hover::after {
  width: 50%; height: 96%;
  opacity: 1;
  transition: height 0.2s 0.2s ease-in, width 0.2s 0.4s linear, opacity 0s 0.2s;   
}

/* 17. hover-border-7 */
.btn.hover-border-7::before,
.btn.hover-border-7::after {
  bottom: 0;
  transition: width 0.2s 0.35s ease-out;
}
.btn.hover-border-7::before {
  right: 50%;
}
.btn.hover-border-7::after {
  left: 50%;
}
.btn.hover-border-7:hover::before,
.btn.hover-border-7:hover::after {
  width: 50%;
  transition: width 0.2s ease-in;   
}

.btn.hover-border-7 span::before,
.btn.hover-border-7 span::after {
  width: 0%; height: 0%;
  background: transparent;
  opacity: 0;
  z-index: 2;
  transition: width 0.2s ease-in, height 0.15s 0.2s linear, opacity 0s 0.35s;
}
.btn.hover-border-7 span::before {
  bottom: 0; left: 0;
  border-left: 2px solid rgb(54, 56, 55);
  border-top: 2px solid rgb(54, 56, 55);
}
.btn.hover-border-7 span::after {
  bottom: 0; right: 0;
  border-right: 2px solid rgb(54, 56, 55);
  border-top: 2px solid rgb(54, 56, 55);
}
.btn.hover-border-7 span:hover::before,
.btn.hover-border-7 span:hover::after {
  width: 50%; height: 96%;
  opacity: 1;
  transition: height 0.2s 0.2s ease-in, width 0.2s 0.4s linear, opacity 0s 0.2s;   
}

/* 18. hover-border-8 */
.btn.hover-border-8::before,
.btn.hover-border-8::after {
  bottom: 0;
  width: 15%;
  transition: width 0.2s 0.35s ease-out;
}
.btn.hover-border-8::before {
  right: 50%;
}
.btn.hover-border-8::after {
  left: 50%;
}
.btn.hover-border-8:hover::before {
  width: 50%;
  transition: width 0.2s ease-in;   
}
.btn.hover-border-8:hover::after {
  width: 50%;
  transition: width 0.1s ease-in;   
}

.btn.hover-border-8 span::before,
.btn.hover-border-8 span::after {
  width: 0%; height: 0%;
  bottom: 0;
  background: transparent;
  opacity: 0;
  z-index: 2;
}
.btn.hover-border-8 span::before {
  left: 0%;
  border-left: 2px solid rgb(54, 56, 55);
  transition: height 0.25s ease-in, opacity 0s 0.35s;   
}
.btn.hover-border-8 span:hover::before {
  height: 96%;
  opacity: 1;
  transition: height 0.25s 0.2s ease-out, opacity 0s 0.2s;   
}
.btn.hover-border-8 span::after {
  right: 0%;
  border-right: 2px solid rgb(54, 56, 55);
  border-top: 2px solid rgb(54, 56, 55);
  transition: width 0.2s ease-in, height 0.15s 0.2s linear, opacity 0s 0.35s;   
}
.btn.hover-border-8 span:hover::after {
  width: 99%; height: 96%;
  opacity: 1;
  transition: height 0.15s 0.1s linear, width 0.2s 0.25s linear, opacity 0s 0.1s;   
}

/* 19. hover-border-9 */
.btn.hover-border-9::before,
.btn.hover-border-9::after {
  bottom: 0;
  width: 15%;
  transition: width 0.2s 0.35s ease-out;
}
.btn.hover-border-9::before {
  right: 50%;
}
.btn.hover-border-9::after {
  left: 50%;
}
.btn.hover-border-9:hover::before {
  width: 50%;
  transition: width 0.1s ease-in;   
}
.btn.hover-border-9:hover::after {
  width: 50%;
  transition: width 0.2s ease-in;   
}

.btn.hover-border-9 span::before,
.btn.hover-border-9 span::after {
  width: 0%; height: 0%;
  bottom: 0;
  background: transparent;
  opacity: 0;
  z-index: 2;
}
.btn.hover-border-9 span::after {
  right: 0%;
  border-right: 2px solid rgb(54, 56, 55);
  transition: height 0.25s ease-in, opacity 0s 0.35s;   
}
.btn.hover-border-9 span:hover::after {
  height: 96%;
  opacity: 1;
  transition: height 0.25s 0.2s ease-out, opacity 0s 0.2s;   
}
.btn.hover-border-9 span::before {
  left: 0%;
  border-left: 2px solid rgb(54, 56, 55);
  border-top: 2px solid rgb(54, 56, 55);
  transition: width 0.2s ease-in, height 0.15s 0.2s linear, opacity 0s 0.35s;   
}
.btn.hover-border-9 span:hover::before {
  width: 98.5%; height: 96%;
  opacity: 1;
  transition: height 0.15s 0.1s linear, width 0.2s 0.25s linear, opacity 0s 0.1s;   
}

/* 20. hover-border-10 */
.btn.hover-border-10::before,
.btn.hover-border-10::after {
  left: 0%;
  height: 30%;
  width: 2px;
  transition: height 0.2s 0.35s ease-out;
}
.btn.hover-border-10::before {
  top: 50%;
}
.btn.hover-border-10::after {
  bottom: 50%;
}
.btn.hover-border-10:hover::before {
  height: 50%;
  transition: height 0.2s ease-in;   
}
.btn.hover-border-10:hover::after {
  height: 50%;
  transition: height 0.1s ease-in;   
}

.btn.hover-border-10 span::before,
.btn.hover-border-10 span::after {
  width: 0%; height: 0%;
  background: transparent;
  opacity: 0;
  z-index: 2;
}
.btn.hover-border-10 span::after {
  bottom: 0; left: 0%;
  border-bottom: 2px solid rgb(54, 56, 55);
  transition: width 0.25s ease-in, opacity 0s 0.35s;   
}
.btn.hover-border-10 span:hover::after {
  width: 100%;
  opacity: 1;
  transition: width 0.25s 0.2s ease-out, opacity 0s 0.2s;   
}
.btn.hover-border-10 span::before {
  top: 0%; left: 0%;
  border-top: 2px solid rgb(54, 56, 55);
  border-right: 2px solid rgb(54, 56, 55);
  transition: height 0.15s ease-in, width 0.2s 0.15s linear, opacity 0s 0.35s;   
}
.btn.hover-border-10 span:hover::before {
  width: 98.5%; height: 96%;
  opacity: 1;
  transition: width 0.2s 0.1s linear, height 0.15s 0.3s ease-out, opacity 0s 0.1s;   
}

/*--- btn-5 ---*/
.btn-5 span {
  color: rgb(28, 31, 30);
  border: 2px solid rgb(249, 211, 27);
  transition: 0.2s;
}
.btn-5 span:hover {
  background-color: rgb(245,245,245);
}

/* 21. hover-border-11 */
.btn.hover-border-11::before,
.btn.hover-border-11::after {
  width: 100%; height: 2px;
  background-color: rgb(54, 56, 55);
  z-index: 2;
  transition: 0.35s; 
}
.btn.hover-border-11::before {
  top: 0; right: 0;
}
.btn.hover-border-11::after {
  bottom: 0; left: 0;
}
.btn.hover-border-11:hover::before,
.btn.hover-border-11:hover::after {
  width: 0%;
  transition: 0.2s 0.2s ease-out; 
}

.btn.hover-border-11 span::before,
.btn.hover-border-11 span::after {
  width: 2px; height: 100%;
  background-color: rgb(54, 56, 55);
  z-index: 2;
  transition: 0.25s; 
}
.btn.hover-border-11 span::before {
  bottom: 0; right: -2px;
}
.btn.hover-border-11 span::after {
  top: 0; left: -2px;
}
.btn.hover-border-11 span:hover::before,
.btn.hover-border-11 span:hover::after {
  height: 0%;
}

This Pen is owned by Marina Osadcha on CodePen.

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