Apply Css code to all the buttons

body {
  background-color: #ff8a80;
  font-family: 'Fjalla One', sans-serif;
    text-transform: uppercase;
  height: 95vh;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
}

/*--Button Styles--*/
.btn-slice {
    padding: 1.2rem 2.5rem;
  border: 2px solid #ffffff;
    border-radius: 0rem;
    color: #ffffff;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.3rem;
  position: relative;
  
  -webkit-transition: all 1000ms cubic-bezier(0.890, 0, 0.140, 1); /* older webkit */
  -webkit-transition: all 1000ms cubic-bezier(0.890, -0.170, 0.140, 1.225); 
  -moz-transition: all 1000ms cubic-bezier(0.890, -0.170, 0.140, 1.225); 
  -o-transition: all 1000ms cubic-bezier(0.890, -0.170, 0.140, 1.225); 
  transition: all 1000ms cubic-bezier(0.890, -0.170, 0.140, 1.225); /* custom */

  -webkit-transition-timing-function: cubic-bezier(0.890, 0, 0.140, 1); /* older webkit */
  -webkit-transition-timing-function: cubic-bezier(0.890, -0.170, 0.140, 1.225); 
  -moz-transition-timing-function: cubic-bezier(0.890, -0.170, 0.140, 1.225); 
  -o-transition-timing-function: cubic-bezier(0.890, -0.170, 0.140, 1.225); 
  transition-timing-function: cubic-bezier(0.890, -0.170, 0.140, 1.225); /* custom */
}

.btn-slice .top  {
    position: relative;
    height: 6px;
    overflow: hidden;
  top: 0;
  -webkit-transition: all 300ms cubic-bezier(1.000, 0, 0.025, 1); /* older webkit */
  -webkit-transition: all 300ms cubic-bezier(1.000, -0.055, 0.025, 1.040); 
  -moz-transition: all 300ms cubic-bezier(1.000, -0.055, 0.025, 1.040); 
  -o-transition: all 300ms cubic-bezier(1.000, -0.055, 0.025, 1.040); 
  transition: all 300ms cubic-bezier(1.000, -0.055, 0.025, 1.040); /* custom */

  -webkit-transition-timing-function: cubic-bezier(1.000, 0, 0.025, 1); /* older webkit */
  -webkit-transition-timing-function: cubic-bezier(1.000, -0.055, 0.025, 1.040); 
  -moz-transition-timing-function: cubic-bezier(1.000, -0.055, 0.025, 1.040); 
  -o-transition-timing-function: cubic-bezier(1.000, -0.055, 0.025, 1.040); 
  transition-timing-function: cubic-bezier(1.000, -0.055, 0.025, 1.040); /* custom */
  
  -webkit-transition-delay:0.35s;     
  -moz-transition-delay::0.35s; 
  -ms-transition-delay::0.35s;     
  -o-transition-delay::0.35s;     
  transition-delay::0.35s;
}

.btn-slice .bottom  {
    position: relative;
    height: 6px;
    overflow: hidden;
  bottom: 0;
  -webkit-transition: all 300ms cubic-bezier(1.000, 0, 0.025, 1); /* older webkit */
  -webkit-transition: all 300ms cubic-bezier(1.000, -0.055, 0.025, 1.040); 
  -moz-transition: all 300ms cubic-bezier(1.000, -0.055, 0.025, 1.040); 
  -o-transition: all 300ms cubic-bezier(1.000, -0.055, 0.025, 1.040); 
  transition: all 300ms cubic-bezier(1.000, -0.055, 0.025, 1.040); /* custom */

  -webkit-transition-timing-function: cubic-bezier(1.000, 0, 0.025, 1); /* older webkit */
  -webkit-transition-timing-function: cubic-bezier(1.000, -0.055, 0.025, 1.040); 
  -moz-transition-timing-function: cubic-bezier(1.000, -0.055, 0.025, 1.040); 
  -o-transition-timing-function: cubic-bezier(1.000, -0.055, 0.025, 1.040); 
  transition-timing-function: cubic-bezier(1.000, -0.055, 0.025, 1.040); /* custom */
  
  -webkit-transition-delay:0.35s;     
  -moz-transition-delay::0.35s; 
  -ms-transition-delay::0.35s;     
  -o-transition-delay::0.35s;     
  transition-delay::0.35s;
}

.btn-slice .bottom span {
  top: -6px;
  position: absolute;
  left: 0;
}

.btn-slice:hover .top {
    top: -5px;
  -webkit-transition-delay:0.35s;     
  -moz-transition-delay::0.35s; 
  -ms-transition-delay::0.35s;     
  -o-transition-delay::0.35s;     
  transition-delay::0.35s; 
}

.btn-slice:hover .bottom {
    bottom: -5px;
  -webkit-transition-delay:0.35s;     
  -moz-transition-delay::0.35s; 
  -ms-transition-delay::0.35s;     
  -o-transition-delay::0.35s;     
  transition-delay::0.35s; 
}
.btn-slice:hover, .btn-slice:focus, .btn-slice:active {
    margin-left: 10px;
}
.btn-slice:before{
    content: '';
    height: 1px;
    width: 60px;
    background-color: #ffffff;
    position: absolute;
    margin-top: 6px;
    right: -35px;
  
  -webkit-transition: all 1000ms cubic-bezier(0.890, 0, 0.140, 1); /* older webkit */
  -webkit-transition: all 1000ms cubic-bezier(0.890, -0.170, 0.140, 1.225); 
  -moz-transition: all 1000ms cubic-bezier(0.890, -0.170, 0.140, 1.225); 
  -o-transition: all 1000ms cubic-bezier(0.890, -0.170, 0.140, 1.225); 
  transition: all 1000ms cubic-bezier(0.890, -0.170, 0.140, 1.225); /* custom */

  -webkit-transition-timing-function: cubic-bezier(0.890, 0, 0.140, 1); /* older webkit */
  -webkit-transition-timing-function: cubic-bezier(0.890, -0.170, 0.140, 1.225); 
  -moz-transition-timing-function: cubic-bezier(0.890, -0.170, 0.140, 1.225); 
  -o-transition-timing-function: cubic-bezier(0.890, -0.170, 0.140, 1.225); 
  transition-timing-function: cubic-bezier(0.890, -0.170, 0.140, 1.225); /* custom */
}
.btn-slice:hover:before{
    width: 130%;
}

Can anyone guide me on how to do this? Or point me out to a guide that shows this?

Thanks