* {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  letter-spacing: 1px;
  font-family: 'Alfa Slab One', serif;
}

body {
  height: 100vh;
}
.rectangulo-negro {
  margin: 0 auto;
  margin-top: 250px;
  height: auto;
  border: 10px solid #000000;
  width: 85vw;
  justify-content: center;
  align-items: center;
  background-color: #ffffff;
  display: flex;
  flex-direction: column;
}

.contenedor-nombre {
  margin: 0 auto;
  font-family: 'Alfa Slab One', serif;
  font-size: 40px;
  text-align: center;
  width: 100%;
}

.fullstack {
  color: #ffffff;
  font-family: 'Alfa Slab One', serif;
  font-size: 20px;
  background-color: #000000;
  justify-content: center;
  align-items: center;
  text-align: center;
   text-transform: uppercase;
   width: 100%;
  
}

.cuadrado-negro {
  width: 100vw;
  height: 100vh;
  background-color: black;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: 'Alfa Slab One', serif;
  font-size: 125px;
  overflow: hidden;
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
  pointer-events: none;
  user-select: none;
}

@keyframes mostrarCodigo {
  0% {
    transform: translateY(-100%);
  }

  100% {
    transform: translateY(0%);
  }
}
@media screen and (min-width: 1200px) {

  .rectangulo-negro {
    margin: 0 auto;
    margin-top: 250px;
    height: 22vh;
    border: 10px solid #000000;
    width: 35vw;
    justify-content: center;
    align-items: center;
    background-color: #ffffff;
    display: flex;
    flex-direction: column;
  }

  .contenedor-nombre {

   font-size: 40px;

  }

  .fullstack {
    color: #ffffff;
    font-size: 20px;
    height: 10vh;
    display: flex;
   
  }

  .cuadrado-negro {
    width: 100vw;
    height: 100vh;
    background-color: black;
    color: rgb(255, 255, 255);
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Alfa Slab One', serif;
    font-size: 150px;
    overflow: hidden;
    position: fixed;
    top: 0;
    left: 0;
    z-index: -1;
    pointer-events: none;
    user-select: none;
    
  }

  @keyframes mostrarCodigo {
    0% {
      transform: translateY(-100%);
    }

    100% {
      transform: translateY(0%);
    }
  }