body {
  align-items: center;
  background-attachment: fixed;
  background-color: var(--color-accent-3-tint-6);
  background-image: url("../images/background-green.jpg");
  background-position: center;
  background-size: cover;
  display: grid;
  margin: 1rem;
}

main {
  --border-width: 2px;
  --border-color: dimgray;
  --gap: 0.25rem;

  background-color: var(--color-accent-2-tint-6);
  background-image: url("../images/background-gray.jpg");
  border: var(--border-width) solid var(--border-color);
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(7, minmax(5rem, 1fr));
  padding: var(--gap);
  position: relative;
}
.calendar-title-container {
  display: flex;
  gap: var(--gap);
  grid-column-end: -1;
  grid-column-start: 1;
  grid-template-columns: 1fr repeat(2, 3ch);
  text-align: center;
}
.calendar-title {
  background-color: var(--color-accent-1);
  color: white;
  flex: 1;
  margin: 0;
  padding: var(--gap);
}
.calendar-title-button {
  background-color: var(--color-accent-1-tint-6);
  border: none;
  color: var(--color-accent-1);
  cursor: pointer;
  font-family: var(--font-heading), sans-serif;
  font-size: 2rem;
  font-weight: 600;
  height: 100%;
  line-height: 1.25em;
  outline-offset: calc(var(--border-width) * -1);
  padding: 0 0.75ch;
  text-decoration: none;
}
.calendar-title-button:hover {
  box-shadow: inset 2px 2px 5px 0 rgba(0, 0, 0, 0.5);
  color: var(--color-accent-1-tint-1);
  outline: var(--border-width) solid currentColor;
}
.calendar-title-button:focus {
  outline: var(--border-width) solid var(--color-accent-1);
}
.calendar-day-of-week {
  background-color: var(--color-accent-2);
  color: white;
  margin: 0;
  padding: var(--gap);
  text-align: center;
}
@media only screen and (max-width: 899px) {
  .calendar-day-of-week {
    font-size: medium;
  }
  .calendar-day-of-month {
    font-size: 0.75rem;
  }
}
.calendar-day-of-month {
  background-color: ghostwhite;
  border: var(--border-width) solid var(--border-color);
  box-sizing: content-box;
  font-weight: 400;
  position: relative;
  text-align: center;
  width: 3ch;
}
.calendar-today {
  background-color: var(--color-accent-1);
  border-color: var(--color-accent-1);
  color: white;
  font-weight: bold;
}
label.calendar-day {
  aspect-ratio: 3 / 2;
  background-color: white;
  color: var(--border-color);
  cursor: pointer;
  outline: var(--border-width) solid var(--border-color);
  outline-offset: calc(var(--border-width) * -1);
  position: relative;
  text-decoration: none;
}
label.calendar-day:focus {
  outline-color: var(--color-accent-1-tint-6);
}
input.calendar-day {
  display: none;
}
label.calendar-day:focus > .events-popup {
  background-color: var(--color-accent-3-tint-7);
  border: var(--border-width) solid var(--color-accent-3);
  display: block;
  left: 50%;
  position: fixed;
  top: 50%;
  transform: translate(-50%, -50%);
}
.events-popup {
  aspect-ratio: 1 / 1;
  background-color: white;
  border: var(--border-width) solid var(--border-color);
  box-shadow: 5px 10px 15px 3px rgba(153, 153, 153, 0.75);
  display: none;
  align-self: center;
  justify-self: center;
  padding: 0.5rem;
  position: absolute;
  width: 30ch;
  z-index: 1;
}
.events-popup h3 {
  color: var(--color-accent-3-shade-1);
}

.calendar-title-button:hover,
label.calendar-day:hover,
label.calendar-day:focus {
  box-shadow: inset 3px 3px 6px 0 rgba(0, 0, 0, 0.5);
}