* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  min-height: 100vh;
  background: rgb(142, 219, 255);
  display: flex;
  align-items: center;
  justify-content: center;
}
.container {
  width: 1200px;
  padding: 10%;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 30px;
}
.card {
  width: 550px;
  min-height: 450px;
  background-color: rgb(255, 255, 255);
  border-radius: 20px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 20px 25px 20px rgba(225, 0, 255, 0.25);
}

.heading {
  font-size: 46px;
  padding: 10px 30px;
  text-shadow: 5px 5px 3px rgba(0, 0, 0, 0.15);
}
.display {
  font-size: 200px;
  margin-bottom: 20px;
  text-shadow: 10px 10px 3px rgba(0, 0, 0, 0.25);
}

.button-container {
  width: 100%;
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-bottom: 50px;
}
/* Designing button */
.btn {
  border: none;
  cursor: pointer;
  padding: 12px 24px;
  border-radius: 50px;
  background: grey;
  font-size: 15px;
  color: white;
  box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.25);
  transition: all 0.3s ease;
}
.btn:hover {
  box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.65);
}
/* button backgrond color */
.btn-increase {
  background-color: rgb(1, 141, 1);
}
.btn-decrease {
  background-color: rgb(255, 30, 30);
}
.btn-reset {
  background-color: rgb(49, 49, 49);
}
/* making color class */
.text-red {
  color: red;
}
.text-green {
  color: green;
}
.text-black {
  color: black;
}

@media (max-width: 700px) {
  .card {
    width: 500px;
  }
  .button-container {
    margin-bottom: 0px;
  }
}