* {
  font-family: "Oswald", sans-serif;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  margin: 0px;
  padding: 0px;
  background-color: rgb(223, 245, 188);
}

header {
  text-align: center;
}

h1 {
  color: rgb(0, 59, 252);
}

a {
  color: rgb(221, 2, 221);
  text-decoration: none;
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px;
  max-width: 400px;
  width: 100%;
  margin: auto;
  border-radius: 15px;
  border: solid 5px;
  background-color: #005073;
}

.display {
  width: 100%;
  max-width: 350px;
  text-align: right;
  font-size: 4em;
  border-radius: 10px;
  border: rgb(150, 150, 150) solid;
  background-color: #219609;
  color: rgb(0, 32, 4);
}

.buttons-container {
  display: grid;
  gap: 5px;
  grid-template-columns: repeat(4, 1fr);
  max-width: 400px;
  width: 100%;
  margin-top: 30px;
  height: 400px;
}

button {
  border-radius: 50px;
  border: black solid;
  font-size: 2em;
  cursor: pointer;
  color: black;
}

.number-value:hover {
  background-color: rgba(255, 255, 255, 0.664);
}

.number-value:active {
  background-color: rgb(255, 255, 255);
}

.function {
  background-color: rgb(255, 230, 0);
}

.function:hover {
  background-color: rgb(184, 165, 0);
}

.function:active {
  background-color: rgb(255, 230, 0);
}

.function-clear {
  background-color: rgb(255, 81, 0);
}

.function-clear:hover {
  background-color: rgb(172, 54, 0);
}

.function-clear:active {
  background-color: rgb(255, 81, 0);
}

@media screen and (max-width: 768px) {
  * {
    overflow:hidden;
  }
  h1,
  h3 {
    display: none;
  }

  .container {
    width: 100vw;
    height: 100vh;
    border-radius: 0px;
    overflow:hidden;
  }

  .display {
    margin-top: 50px;
    width: 280px;
    font-size: 4em;
  }

  .buttons-container {
    max-width: 300px;
  }
}