body {
  height: 80vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: hsl(0, 0%, 90%);
  font-family: Arial, sans-serif;
}

.container {
  text-align: center;
}

h1 {
  font-size: 3.5rem;
  color: hsl(0, 0%, 25%);
}

.box {
  width: auto;
  background-color: white;
  border: 5px solid;
  border-radius: 50px;
  display: flex;
  flex-direction: column;
  justify-content: start;
  align-items: center;
  padding: 2em;
}

.display {
  font-size: 6rem;
  font-weight: bolder;
  font-family: monospace;
  color: hsl(0, 0%, 30%);
  text-shadow: 2px 2px 2px hsla(0, 0%, 0%, 0.275);
  margin-bottom: 25px;
}

button {
  font-size: 1.5rem;
  font-weight: bold;
  padding: 10px 20px;
  margin: 5px;
  min-width: 125px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  color: white;
  transition: all 0.3s ease-in-out;
}

#start {
  background-color: hsl(115, 100%, 40%);
}

#start:hover {
  background-color: hsl(115, 100%, 30%);
  transform: translateX(-10%);
}

#stop {
  background-color: hsl(0, 100%, 50%);
}

#stop:hover {
  background-color: hsl(0, 100%, 40%);
  transform: translateY(-20%);
}

#reset {
  background-color: hsl(209, 100%, 60%);
}

#reset:hover {
  background-color: hsl(209, 100%, 50%);
  transform: translateX(10%);
}

@media screen and (width<=760px) {
  .box {
    padding: 1em;
  }
  .display {
    font-size: 2rem;
  }

  h1 {
    font-size: 2.5rem;
    color: hsl(0, 0%, 25%);
  }
  @media screen and (width <=350px) {
    .box {
      padding: 1em 0;
      width: 100%;
      margin-left: -0.25em;
    }
  }
}