style.css

@import url('https://fonts.googleapis.com/css2?family=Roboto+Mono&family=Zen+Maru+Gothic:wght@500&display=swap');

* {
  margin: 0px;
  padding: 0px;
}

.timer {
  position: relative;
  background-image: url('city_at_night.jpg');
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 背景画像と文字を区別させるためのオーバーレイ */
.timer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.3);
}

.countdown {
  position: relative;
  color: #fff;
  text-align: center;
}

.countdown-title {
  font-family: 'Zen Maru Gothic', sans-serif;
  font-size: 2.5rem;
}

.times {
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: 'Roboto Mono', monospace;
}

.time {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 20px;
  font-size: 2rem;
}

.time-num {
  font-size: 8rem;
}