styles.css

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

body {
  width: 100vw;
  height: 100vh;
  background-color: #D6001C;
  font-family: sans-serif;
  color: white;
  overflow: hidden;
}

h1 {
  text-align: center;
  margin-top: 5vmin;
}

#calendar {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.house-img {
  height: 90vmin;
}

.doors {
  position: absolute;
  margin-top: 8vmin;
  margin-left: -10vmin;
  width: 43vmin;
  display: grid;
  gap: 1vmin;
  grid-template-columns: repeat(5, 1fr);
}

.doors .door {
  width: 10vmin;
  height: 10vmin;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  cursor: pointer;
  overflow: hidden;
}

.doors .door .door-number {
  position: absolute;
  display: block;
  background: #CDB69D;
  width: 4vmin;
  height: 4vmin;
  font-family: sans-serif;
  color: black;
  font-size: 5vmin;
  margin-top: -4vmin;
  margin-left: -1vmin;
  text-align: center;
}

.doors .door img {
  width: 100%;
}

.doors .door:hover {
  overflow: visible;
  z-index: 9999;
}

.doors .door img.bird-image {
  transition-duration: 2s;
}

.doors .door img.bird-image:hover {
  transform: scale(3);
  z-index: 9999;
}