.clock-widget {
  background-color: #b52000;
  color: #fff;
  padding: 15px;
  border-radius: 10px;
  text-align: center;
  font-family: Arial, sans-serif;
  box-shadow: 0 0 10px rgba(0,0,0,0.4);
  max-width: 100%;
}

.clock-widget #clock {
  font-size: 2em;
  margin-bottom: 5px;
}

.clock-widget #calendar {
  font-size: 1em;
}

@media (max-width: 400px) {
  .clock-widget #clock {
    font-size: 5vw;
  }
  .clock-widget #calendar {
    font-size: 3.5vw;
  }
}