body {
  height: 100vh;
  width: 100vw;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: black;
}

.card {
  width: 400px;
  height: 300px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  background-color: aquamarine;
  border-radius: 10px;
  margin: auto;
  padding: auto;
  position: relative;
}
.title {
  display: flex;
  justify-content: center;
  align-items: center;
}
.time {
  position: absolute;
  left: 50%;
  bottom: 150px;
  transform: translateX(-50%);
}
.button {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  position: absolute;
  bottom: 50px;
  left: 50%;
  transform: translateX(-50%);
}

.start {
  background-color: green;
  margin-right: 5px;
}
.stop {
  background-color: red;
  margin-right: 5px;
}
.reset {
  background-color: blanchedalmond;
}