:root {
    -redColor : rgba(244,67,54,1);
    -blueColor : rgba(33,150,243,1);
}
.flex-center {
  width: 50%;
  min-height: 50vh;
  
  background: #000;
  
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display:flexbox ;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
  -webkit-align-items: center;
      -ms-flex-align: center;
          align-items: center;
}

.icon-3d {
    padding: 10px;
    -webkit-animation: icon3d 200ms 10;
    animation: icon3d 200ms 10;
    color: #fff;
}
 .icon-3d:hover {
    -webkit-animation: icon3d 200ms infinite;
          animation: icon3d 200ms infinite;
  }


@keyframes icon3d {
  0% {
    text-shadow: 5px 4px rgba(244,67,54,1), -5px -6px rgba(33,150,243,1);
  }
  25% {
    text-shadow: -5px -6px rgba(244,67,54,1), 5px 4px rgba(33,150,243,1);
  }
  50% {
    text-shadow: 5px -4px rgba(244,67,54,1), -8px 4px rgba(33,150,243,1);
  }
  75% {
    text-shadow: -8px -4px rgba(244,67,54,1), -5px -4px rgba(33,150,243,1);
  }
  100% {
    text-shadow: -5px 0 rgba(244,67,54,1), 5px -4px rgba(33,150,243,1);
  }
}





.btn-1 {
    background: #e1332d;
    font-weight: 100;

    svg {
        height: 45px;
        left: 0;
        position: absolute;
        top: 0;
        width: 100%;
    }

    rect {
        fill: none;
        stroke: #fff;
        stroke-width: 2;
        stroke-dasharray: 422, 0;
        transition: all 0.35s linear;
    }
}

.btn-1:hover {
    background: rgba($red, 0);
    font-weight: 900;
    letter-spacing: 1px;

    
}
.btn-1 rect {
        stroke-width: 5;
        stroke-dasharray: 15, 310;
        stroke-dashoffset: 48;
        transition: all 1.35s cubic-bezier(0.19, 1, 0.22, 1);
    }