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.boton-mas svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.boton-mas svg rect {
  stroke-width: 1;
  stroke-dasharray: 353, 0;
  stroke-dashoffset: 0;
  transition: all 600ms ease;
}

.boton-mas:hover svg rect {
  stroke-dasharray: 98, 543;
  stroke-dashoffset: 437;
}