style.css

/* Rest Page Style */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #111722;
  font-family: "Manrope", sans-serif;
}

/* Calculator Container Style */
.calc-container {
  background-color: #1e2232;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
  width: 90vw;
  max-width: 320px;
}

/* Calculator Input Screen Style */
.calc-screen {
  width: 100%;
  height: 60px;
  background-color: #344465;
  border: none;
  color: #fff;
  font-size: 2rem;
  text-align: right;
  padding: 10px;
  margin-bottom: 20px;
  border-radius: 8px;
}

/* Calculator Buttons Style */
.calc-btns {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

button:active {
  transform: scale(0.95);
  transition: transform 0.1s ease-in-out;
}

button {
  width: 100%;
  padding: 20px;
  font-size: 1.5rem;
  border: none;
  border-radius: 8px;
  background-color: #243047;
  color: #fff;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.1s ease-in-out;
}

button:hover {
  background-color: #195de6;
}

button[value="C"] {
  background-color: #ff5c5c;
}

button[value="="] {
  background-color: #195de6;
}

/* Media Queries for Responsive Desgin */
/* for MobileScreen */
@media screen and (max-width: 600px) {
  .calc-container {
    width: 95vw;
    max-width: 400px;
  }

  .calc-screen {
    font-size: 1.75rem;
    height: 50px;
  }

  button {
    padding: 15px;
    font-size: 1.25rem;
  }
}

/* for Tablets Screen */
@media screen and (max-width: 768px) {
  .calc-container {
    width: 80vw;
    max-width: 450px;
  }

  .calc-screen {
    font-size: 1.85rem;
    height: 55px;
  }

  button {
    padding: 18px;
    font-size: 1.3rem;
  }
}

/* for Desktops Screen */
@media screen and (max-width: 1024px) {
  .calc-container {
    width: 320px;
  }

  .calc-screen {
    height: 60px;
  }

  button {
    font-size: 1.5rem;
    padding: 20px;
  }
}