<link href="https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400&display=swap" rel="stylesheet">

<div class="container">
  <div class="block">
    <div class="btn btn1">
      <h4>click</h4>
    </div>
    <div class="btn btn2">
      <h4>click</h4>
    </div>
    <div class="btn btn3">
      <h4>click</h4>
    </div>
  </div>
  <div class="block">
    <div class="btn btn4">
      <h4>click</h4>
    </div>
    <div class="btn btn5">
      <h4>click</h4>
    </div>
    <div class="btn btn6">
      <h4>click</h4>
    </div>
  </div>
  <div class="block">
    <div class="btn btn7">
      <h4>click</h4>
    </div>
    <div class="btn btn8">
      <span></span><span></span>
      <span></span><span></span>
      <span></span><span></span>
      <h4>click</h4>
    </div>
    <div class="btn btn9">
      <h4>click</h4>
    </div>
  </div>
  <div class="block">
    <div class="btn btn10">
      <span></span><span></span><span></span><span></span>
      <span></span><span></span><span></span><span></span>
      <span></span><span></span><span></span>
      <h4>click</h4>
    </div>
    <div class="btn btn11">
      <h4>click</h4>
    </div>
    <div class="btn btn12">
      <span></span><span></span>
      <span></span><span></span>
      <h4>click</h4>
    </div>
  </div>
</div>

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

html {
  font-family: "Montserrat", sans-serif;
}

h4 {
  font-weight: 400;
  text-transform: uppercase;
  font-size: 20px;
  color: #111;
}

.container {
  min-height: 100vh;
  height: auto;
  width: 100vw;
  overflow: hidden;
  background: #000428;
  background: linear-gradient(to right, #bdfff3, #4ac29a);
  position: relative;
}

.block {
  height: 150px;
  width: 100%;
  display: flex;
  padding: 10px;
  justify-content: space-around;
  flex-wrap: wrap;
  align-items: center;
  margin: 30px;
}

.btn {
  height: 60px;
  width: 150px;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.8s ease;
  position: relative;
  border: 2px solid #111;
  margin: 0 40px;
  box-shadow: rgba(50, 50, 93, 0.25) 0px 50px 100px -20px,
    rgba(0, 0, 0, 0.3) 0px 30px 60px -30px;
}

.btn::before,
.btn::after {
  position: absolute;
  display: block;
  content: "";
  width: 100%;
  height: 100%;
}

/* =============== Hover Effect 1 ======================== */
/* Change border color, background color and text color on hover */

.btn1 {
  transition: all 300ms cubic-bezier(0.39, 0.575, 0.565, 1);
  background-color: hsla(323, 87%, 50%, 0.664);
  border: 2px solid #111;
}

.btn1 h4 {
  color: #111;
  font-weight: 600;
}

.btn1:hover {
  border: 2px solid #111;
  box-shadow: 0px 0px 26px 8px hsla(323, 87%, 50%, 0.664);
  background-color: #000428;
}

.btn1:hover h4 {
  color: hsla(323, 87%, 50%, 0.664);
}

/* =============== Hover Effect 2 ======================== */
/* Before element's width and height increased from 0 to 100% on hover and after  */
/* element's width and height decreased from 100% to zero */

.btn2 {
  border: none;
  z-index: 10;
}

.btn2 h4 {
  z-index: 10;
  color: #111;
}

.btn2:after {
  border: 2px solid #111;
  transition: all 300ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.btn2:before {
  width: 0;
  height: 0;
  transition: all 500ms ease;
}

.btn2:hover:after {
  width: 0;
  height: 0;
  opacity: 0;
}

.btn2:hover:before {
  width: 100%;
  height: 100%;
  background-color: #111;
}

.btn2:hover h4 {
  color: #fff;
}

/* =============== Hover Effect 3 ======================== */
/* Change the shadow value on hover */

.btn3 {
  box-shadow: rgba(0, 0, 0, 0.19) 0px 10px 20px, rgba(0, 0, 0, 0.23) 0px 6px 6px;
  transition: all300ms ease;
  border-radius: 20px;
}

.btn3:hover {
  box-shadow: rgba(50, 50, 93, 0.25) 0px 30px 60px -12px inset,
    rgba(0, 0, 0, 0.3) 0px 18px 36px -18px inset;
}

/* =============== Hover Effect 4 ======================== */
/* On hover the after pseudo element move from left to right, the shape of pseudo element is made into a */
/* rhombus using clip path property */

.btn4 {
  overflow: hidden;
}

.btn4:after {
  left: -100%;
  clip-path: polygon(10% 0, 70% 0, 90% 100%, 30% 100%);
  background-color: rgba(255, 255, 255, 0.6);
  transition: all 300ms ease;
}

.btn4:hover::after {
  left: 100%;
}

/* =============== Hover Effect 5 ======================== */
/* On hover after element moves from -300% in left to -100%, the lement is rotate 45 degree to be a  */
/* sharp edge. To get the fill effect the element is made 300% in size, parent element's overflow is  */
/* set to hidden */

.btn5 {
  overflow: hidden;
  transition: all 300ms ease;
}

.btn5 h4 {
  color: #111;
}

.btn5:after {
  width: 300%;
  height: 300%;
  left: -300%;
  transform: rotate(45deg);
  background-color: #f21170;
  transition: all 300ms ease;
}

.btn5:hover h4 {
  color: #fff;
  z-index: 10;
  font-weight: 600;
}

.btn5:hover::after {
  left: -100%;
}

.btn5:hover {
  border: 2px solid #f21170;
}

/* =============== Hover Effect 6 ======================== */
/* the after and before sudo element's width is incresed frpm 0 to 50% on hover */
/* before is positioned at top and after at bottom */

.btn6 {
  overflow: hidden;
  border: none;
  box-shadow: 0px 0px 1px 1px;
  z-index: 1;
  transition: all 200ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.btn6 h4 {
  color: #111;
  z-index: 100;
}

.btn6::after,
.btn6::before {
  content: "";
  text-transform: uppercase;
  text-align: center;
  z-index: 1;
  width: 100%;
  height: 0%;
  transition: all 200ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.btn6:after {
  top: 0px;
  z-index: 2;
}

.btn6:before {
  bottom: 0px;
  z-index: 2;
}

.btn6:hover:after {
  background-color: #111;
  height: calc(50% + 1px);
}

.btn6:hover:before {
  height: calc(50% + 1px);
  background-color: #72147e;
}

.btn6:hover h4 {
  color: #fff;
}

/* =============== Hover Effect 7 ======================== */
/* before and after elements are rotated using animation on hover, rotation of before element  */
/* starts at a 45 degree with the after pseudo element */

.btn7 {
  border: none;
}

.btn7:before,
.btn7:after {
  border: 2px solid #111;
  transition: all 100ms cubic-bezier(0.445, 0.05, 0.55, 0.95);
}

.btn7:hover:after {
  width: 63px;
  animation: anim7a 1.5s infinite linear;
}

.btn7:hover:before {
  width: 63px;
  animation: anim7b 1.5s infinite linear;
}

@keyframes anim7a {
  from {
    transform: rotate(0turn);
  }
  to {
    transform: rotate(1turn);
  }
}

@keyframes anim7b {
  from {
    transform: rotate(0.125turn);
  }
  to {
    transform: rotate(1.125turn);
  }
}

/* =============== Hover Effect 8 ======================== */
/* 6 spans are used here, all have 0px height, on hover the height is increased to 50%, 3 spans  */
/* are placed at top and three at bottom */
.btn8 {
  position: relative;
  width: 150px;
  border: 3px solid #111;
  z-index: 1;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
}

.btn8 h4 {
  position: absolute;
  z-index: 10;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
}

.btn8 span {
  background-color: #111;
  height: 00px;
  width: 25px;
  z-index: 1;
  display: block;
  position: absolute;
  transition: all 400ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.btn8 span:nth-child(2),
.btn8 span:nth-child(4),
.btn8 span:nth-child(6) {
  top: 0;
}

.btn8 span:nth-child(2) {
  left: 25px;
}

.btn8 span:nth-child(4) {
  left: 75px;
}

.btn8 span:nth-child(6) {
  left: 125px;
}

.btn8 span:nth-child(1),
.btn8 span:nth-child(3),
.btn8 span:nth-child(5) {
  bottom: 0;
}

.btn8 span:nth-child(1) {
  left: 0px;
}

.btn8 span:nth-child(3) {
  left: 50px;
}

.btn8 span:nth-child(5) {
  left: 100px;
}

.btn8:hover span {
  height: calc(60px - 2px);
}

/* =============== Hover Effect 9 ======================== */
/* On hover the height of after element is increased to 150% which cause the left and right border to grow */
/* similarly the before elements's width is increased to 120% cause the top and bottom border to grow*/

.btn9 {
  border: none;
  background-color: #fff;
  transition: all 200ms cubic-bezier(0.165, 0.84, 0.44, 1);
}

.btn9:after,
.btn9:before {
  transition: all 200ms cubic-bezier(0.165, 0.84, 0.44, 1);
  width: 10%;
  height: 10%;
}

.btn9:hover {
  background-color: transparent;
}

.btn9:hover:before {
  border-bottom: 2px solid #111;
  border-top: 2px solid #111;
  width: 120%;
  height: 100%;
}

.btn9:hover:after {
  border-left: 2px solid #111;
  border-right: 2px solid #111;
  height: 150%;
  width: 100%;
}

/* =============== Hover Effect 10 ======================== */
/* On hover span height grow from 0 to 100%, each span is given differnet transition to create the pattern */

.btn10 {
  position: relative;
  z-index: 1;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
}

.btn10 h4 {
  position: absolute;
  z-index: 10;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #111;
}

.btn10 span {
  background-color: #111;
  height: 00px;
  width: 50px;
  position: relative;
  bottom: 0;
  z-index: 1;
}

.btn10 span:nth-child(1) {
  transition: all 1300ms ease;
}
.btn10 span:nth-child(2) {
  transition: all 1100ms ease;
}
.btn10 span:nth-child(3) {
  transition: all 900ms ease;
}
.btn10 span:nth-child(4) {
  transition: all 700ms ease;
}
.btn10 span:nth-child(5) {
  transition: all 500ms ease;
}
.btn10 span:nth-child(6) {
  transition: all 300ms ease;
}
.btn10 span:nth-child(7) {
  transition: all 500ms ease;
}
.btn10 span:nth-child(8) {
  transition: all 700ms ease;
}
.btn10 span:nth-child(9) {
  transition: all 900ms ease;
}
.btn10 span:nth-child(10) {
  transition: all 1100ms ease;
}
.btn10 span:nth-child(11) {
  transition: all 1300ms ease;
}

.btn10:hover span {
  height: 100px;
}

.btn10:hover h4 {
  color: #fff;
}

/* =============== Hover Effect 11 ======================== */
/* Before hover the before and after pseudo elements are translated 150px and -150px in x direction */
/* the pseudo elements are given a triangle shape using clip path property */
/* on hover the pseudo elements are translated to 0px in x direction  */
.btn11 {
  overflow: hidden;
}

.btn11 h4 {
  z-index: 10;
}

.btn11:before,
.btn11:after {
  height: 0;
  width: 100%;
  height: 100%;
  background-color: #f21170;
  transition: all 300ms cubic-bezier(0.455, 0.03, 0.515, 0.955);
}

.btn11:before {
  clip-path: polygon(100% 0, 0% 100%, 0 0);
  transform: translateX(-150px);
}

.btn11:after {
  clip-path: polygon(100% 0, 0% 100%, 100% 100%);
  transform: translateX(150px);
}

.btn11:hover:before,
.btn11:hover:after {
  transform: translateX(0px);
}

/* =============== Hover Effect 12 ======================== */
/* four spans are places at four corner, on hover they are brought to the center */

.btn12 {
  overflow: hidden;
}

.btn12 h4 {
  z-index: 10;
  transition: all 300ms 100ms cubic-bezier(0.55, 0.055, 0.675, 0.19);
}

.btn12 span {
  position: absolute;
  width: 50%;
  height: 0%;
  background-color: #126e82;
  transition: all 300ms cubic-bezier(0.55, 0.055, 0.675, 0.19);
}

.btn12 span:nth-child(1) {
  top: 0;
  left: 0;
  transform: translateX(-100%);
}

.btn12 span:nth-child(2) {
  bottom: 0;
  left: 0;
  transform: translateX(-100%);
}

.btn12 span:nth-child(3) {
  top: 0;
  right: 0;
  transform: translateX(100%);
}

.btn12 span:nth-child(4) {
  bottom: 0;
  right: 0;
  transform: translateX(100%);
}

.btn12:hover span {
  transform: translateX(0px);
  height: 50%;
}

.btn12:hover h4 {
  color: #fff;
}