:root {
  --txt-clr: #272341;
  --txt-fcs: #3498db;
  --back-clr: #e5e5e5;
  --boxShadow-out: -3px -3px 7px #ffffff73,
    2px 2px 5px rgba(94, 104, 121, 0.288);
  --boxShadow-in: inset -3px -3px 7px #ffffff73,
    inset 2px 2px 5px rgba(94, 104, 121, 0.288);
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Open Sans", sans-serif;
  font-style: italic;
  color: var(--txt-clr);
  transition: background-color 400ms ease-out, color 300ms ease-in,
    box-shadow 600ms ease-out;
}

html,
body {
  height: 100%;
  width: 100vw;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  background-color: var(--back-clr);
}

.wrapper {
  display: grid;
  place-items: center;
  position: relative;
  height: 210px;
  width: 600px;
  cursor: default;
  border-radius: 10px;
  box-shadow: var(--boxShadow-out);
}

.wrapper .display {
  display: grid;
  place-items: center;
  position: absolute;
  top: 15%;
  left: 50%;
  transform: translate(-50%, -15%);
  height: 80px;
  width: 400px;
  text-align: center;
  border-radius: 6px;
  box-shadow: var(--boxShadow-in);
}

.wrapper .display #time {
  font-size: 50px;
  font-weight: 800;
  letter-spacing: 4px;
}

.wrapper .format {
  position: absolute;
  top: 65%;
}
.wrapper .format span {
  font-size: 14px;
  font-weight: 600;
  cursor: default;
  border-radius: 4px;
  padding: 0.4em 1em;
}
span:nth-of-type(1) {
  box-shadow: var(--boxShadow-in);
  color: var(--txt-fcs);
}
span:nth-of-type(2) {
  box-shadow: var(--boxShadow-out);
}
.wrapper .format .Mode {
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--txt-clr);
  outline: none;
  border: none;
  text-transform: uppercase;
  padding: 0.5em 0.8em;
  margin: 0 3em;
  border-radius: 3px;
  background-color: var(--back-clr);
  font-weight: 800;
  box-shadow: var(--boxShadow-out);
  letter-spacing: 3px;
}
.wrapper .format .Mode:active {
  box-shadow: var(--boxShadow-in);
  color: var(--txt-fcs);
}
@media (max-width: 600px) {
  .wrapper {
    height: 40vw;
    width: 90vw;
  }
  .wrapper .display {
    height: 15vw;
    width: 70vw;
  }
  .wrapper .display #time {
    font-size: 9vw;
    letter-spacing: 3px;
  }
  .wrapper .format {
    top: 62%;
  }
  .wrapper .format span {
    font-size: 3vw;
    padding: 0.3em 0.65em;
  }
  .wrapper .format .Mode {
    font-size: 3.1vw;
    letter-spacing: 2px;
    margin: 0 1.7em;
  }
}