style.scss

@import url("https://fonts.googleapis.com/css2?family=Ubuntu:wght@400;700&family=Oswald:wght@400;700&display=swap");
$fuente-0: "Oswald", sans-serif;
$fuente-1: "Ubuntu", sans-serif;

body {
  background-color: black;
  color: whitesmoke;
  max-width: 800px;
  margin: 0 auto;
  font-family: $fuente-1;

  h3 {
    font-family: $fuente-0;
    text-transform: uppercase;
  }
}

.trabajos {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  align-items: center;
  animation-name: inicioTrabajos;
  animation-duration: 2s;
}
@keyframes inicioTrabajos {
  0% {
    opacity: 0;
  }
  50% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

article * {
  margin: 5px;
}

article {
  img {
    display: block;
    width: 90%;
    margin: 10px auto;
    filter: grayscale(90%);
    border-radius: 4px;
    transition: 0.4s;
  }
  &:hover {
    img {
      transform: scale(1.05);
      filter: grayscale(0%);
    }
    .titulo {
      color: #f7c301;
    }
  }
}
p.poster a,
p.informe a {
  text-decoration: none;
  display: block;
  color: white;
  border: 1px solid white;
  margin: 5px;
  padding: 5px;
  text-align: center;
  transition: 0.3s;
}
p.poster a:hover,
p.informe a:hover {
  transform: scale(1.05);
  color: #f7c301;
}

.presentacion {
  display: flex;
  justify-content: space-evenly;
  animation: inicio 1s;
  .texto {
    text-align: justify;
    width: 65%;
  }
  h1,
  h2 {
    text-align: center;
  }
  figure {
    margin: auto auto;
  }
  img {
    width: 100%;
  }
}

@keyframes inicio {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@media only screen and (max-width: 799px) {
  .trabajos {
    grid-template-columns: 1fr 1fr;
  }
}
@media only screen and (max-width: 599px) {
  .trabajos {
    grid-template-columns: 1fr;
  }
  .presentacion {
    display: inherit;
    .texto {
      width: inherit;
      padding: 5vw;
    }
    figure {
      width: 80px;
    }
  }
  .poster {
    margin: 20px auto;
  }
}