Step-11 at conference building interface

style.css

:root {
  --main-bg: rgb(238, 238, 238);
  --stage-time-bg: rgba(217, 217, 217);

  --blue-slot-bg: rgba(52, 129, 174, 0.3);
  --blue-slot-text: rgba(52, 129, 174, 1);

  --green-slot-bg: rgba(49, 223, 118, 0.42);
  --green-slot-text: rgba(40, 188, 99, 1);

  --red-slot-bg: rgba(223, 49, 49, 0.28);
  --red-slot-text: rgba(223, 49, 49, 0.75);

  --yellow-slot-bg: rgba(255, 230, 0, 0.3);
  --yellow-slot-text: rgb(229, 168, 46);

  --break-bg: rgba(83, 83, 83);
  --break-text: rgba(38, 38, 38, 1);

  --break-time-highlight: rgba(255, 110, 5, 0.5);
}

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

html {
  font-size: 62.5%;
}

body {
  height: 100%;
  background: var(--main-bg);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-size: 1.6rem;
  line-height: 1.5;
}

/*********************
*** GRID STYLING ****/
/********************/

.main-container {
  min-height: 100vh;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(11, 1fr);
  gap: 1.5rem;
}

/*===== TOP STAGES CONTAINER ====*/

.stages-container-row {
  grid-column: 2 / -1;
  grid-row: 1 / 2;
}

.stages {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.stage {
  padding: 3rem 4rem;
}

.stage,
.time {
  background: var(--stage-time-bg);
  border-radius: 1rem;
}

.details {
  display: flex;
  flex-direction: column;
}

/*===== LEFT TIMING CONTAINER =====*/

.timing-container-column {
  grid-column: 1 / 2;
  grid-row: 1 / -1;
}

.timings {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 0 1rem;
}

.time {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 3rem;

  background: var(--stage-time-bg);
  border-radius: 1rem;
}

/*===== SUBGRID OF OUR MAIN UI =====*/

.subgrid-main-ui {
  grid-column: 2 / -1;
  grid-row: 2 / -1;

  display: grid;

  /* Currenlty not supported by Chrome, please check it in Firefox
     to see the subgrid option*/
  grid-template-columns: subgrid;
  grid-template-rows: repeat(10, 1fr);
  gap: 1rem;
}