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

.timer_body {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background-color: black;
  display: flex;
  align-items: center;
  justify-content: center;
}

body {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-direction: row;
}

.countdown_timer_buttons_div,
.regular_timer_buttons_div {
  display: flex;
  margin-top: 50px;
}

button {
  font-size: 2em;
  margin-left: 20px;
  margin-right: 20px;
  padding: 10px;
}

.timer_display,
.countdown_timer_display {
  background-color: white;
  padding: 25px;
  font-size: 2em;
  border-radius: 5px;
}

.just_timer,
.countdown_timer {
  display: flex;
  justify-content: center;
  flex-direction: column;
  align-items: center;
}

.invisible {
  opacity: 0;
}

.annotation_1 {
  position: absolute;
  top: 80px;
}

.annotation_2 {
  position: absolute;
  top: 100px;
}