HTMLify

/* GENERAL CSS */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* VIDEO */
.video {
  width: 100vw;
  height: 100vh;

  position: fixed;
  top: 0;
  left: 0;

  z-index: -1;
}

.video video {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);

  min-width: 100%;
  min-height: 100%;
}

/* APP */
.app {
  width: 100vw;
  height: 100vh;
  display: grid;
  grid-template-areas:
    "a a a a s s"
    "a a a a s s"
    "d d d d s s"
    "d d d d s s";

  transition: opacity 500ms ease-in-out;
}
.inactive {
  opacity: 0;
}

/* AUDIO */
.audio {
  grid-area: a;
  display: flex;
  align-items: center;
  justify-content: center;
}
.audio img {
  width: 50px;
  cursor: pointer;
}
.audio .progress {
  width: 200px;
  height: 200px;

  position: relative;

  margin: 0 40px;
}
.audio .progress svg {
  width: 200px;
  height: 200px;

  transform: rotate(45deg);

  position: absolute;
  z-index: -1;
}
.audio .progress .audio-remaining-time {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);

  color: #fff;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  font-size: 2rem;
  font-weight: bold;
}
/* DURATIONS */
.durations {
  grid-area: d;

  display: flex;
  justify-content: space-around;
  align-items: center;

  padding: 0 25%;
}
.durations .duration {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.durations .duration img {
  width: 75px;
  cursor: pointer;

  filter: drop-shadow(0px 0px 15px #222);
}
.durations .duration p {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  font-size: 1.1rem;
  font-weight: bold;

  color: #fff;

  margin-top: 5px;

  text-shadow: 0px 0px 15px #222;
}
/* SEASONS */
.seasons {
  grid-area: s;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
  padding: 40% 0;
}
.seasons .season img {
  width: 75px;
  cursor: pointer;
  filter: drop-shadow(0px 0px 15px #222);
}

/* TOGGLE MENU */
.toggle-menu {
  display: none;
}

/* FOR SMALL SCREENS */
@media screen and (max-width: 600px) {
  /* VIDEO */
  .video video {
    height: 100%;
  }

  /* APP */
  .app {
    grid-template-areas:
      "a"
      "a"
      "a"
      "d";
  }

  /* AUDIO */
  .audio .progress {
    width: 175px;
    height: 175px;

    margin: 0 10px;
  }
  .audio .play img,
  .pause img {
    width: 40px;
  }
  .audio .progress svg {
    width: 175px;
    height: 175px;
  }
  .audio .progress .rect1,
  .rect {
    width: 125px;
    height: 125px;
  }
  .audio .progress .audio-remaining-time {
    font-size: 1.75rem;
  }

  /* DURATIONS */
  .durations {
    padding: 0 10%;
  }
  .durations .duration img {
    width: 60px;
  }
  .durations .duration p {
    font-size: 1rem;
  }

  /* SEASONS */
  .seasons {
    position: absolute;
    top: 20px;
    left: -250px;
    padding: 5px;

    flex-direction: row;

    background-color: #fff;

    border-radius: 0 5px 5px 0;

    transition: left 500ms ease-in-out;
  }
  .open {
    left: 0px;
  }
  .seasons .season {
    margin-left: 10px;
  }
  .seasons .season img {
    width: 50px;
    filter: none;
  }

  /* TOGGLE MENU */
  .toggle-menu {
    display: flex;
    align-items: center;
    justify-content: center;

    padding: 5px;

    margin-left: 10px;

    border-radius: 50%;

    transition: all 500ms ease-in-out;
  }
  .rotate {
    transform: rotate(180deg);
  }
  .toggle-menu:hover {
    background-color: rgba(0, 0, 0, 0.2);
    cursor: pointer;
  }
  .toggle-menu img {
    width: 20px;
  }
}