* {
  padding: 0;
  margin: 0;
  font-size: 20px;
}

.wrapper {
  text-align: center;
}

.calculator {
  padding: 60px 0;
  margin: 0 auto;
}

.manipulate-btns, .input-field {
  margin: 0 auto;
  padding: 30px 0 30px 0;
  background-color: #003955;
}

.field {
  border: none;
  padding: 10px;
  background-color: #efefef;
}

.manipulate-btns button {
  padding: 10px 15px;
  margin: 2px 3px;
  border: none;
  background-color: rgb(255, 0, 0, .0);
  color: #fff;
}

.field:focus {
  outline: none;
}

.manipulate-btns button:hover {
  background-color: rgba(187, 187, 187, 0.1);
}

@media screen and (min-width: 1450px) {
  .calculator {
    width: 30%;
  }

  .manipulate-btns, .input-field {
    width: 60%;
  }

  .field {
    width: 76%;
  }

  .manipulate-btns button {
    width: 25%;
  }
}

@media screen and (min-width: 1000px) and (max-width: 1450px) {
  .calculator {
    width: 40%;
  }

  .manipulate-btns, .input-field {
    width: 60%;
  }

  .field {
    width: 76%;
  }

  .manipulate-btns button {
    width: 25%;
  }
}

@media screen and (min-width: 800px) and (max-width: 999px) {
  .calculator {
    width: 50%;
  }

  .manipulate-btns, .input-field {
    width: 60%;
  }

  .field {
    width: 76%;
  }

  .manipulate-btns button {
    width: 25%;
  }
}

@media screen and (min-width: 700px) and (max-width: 800px) {
  .calculator {
    width: 60%;
  }

  .manipulate-btns, .input-field {
    width: 60%;
  }

  .field {
    width: 82%;
  }

  .manipulate-btns button {
    width: 25%;
  }
}

@media screen and (min-width: 600px) and (max-width: 700px) {
  .calculator {
    width: 60%;
  }

  .manipulate-btns, .input-field {
    width: 70%;
  }

  .field {
    width: 82%;
  }

  .manipulate-btns button {
    width: 25%;
  }
}

@media screen and (min-width: 500px) and (max-width: 600px) {
  .calculator {
    width: 70%;
  }

  .manipulate-btns, .input-field {
    width: 70%;
  }

  .field {
    width: 82%;
  }

  .manipulate-btns button {
    width: 25%;
  }
}

@media screen and (min-width: 400px) and (max-width: 500px) {
  .calculator {
    width: 90%;
  }

  .manipulate-btns, .input-field {
    width: 70%;
  }

  .field {
    width: 82%;
  }

  .manipulate-btns button {
    width: 25%;
  }
}

@media screen and (min-width: 300px) and (max-width: 400px) {
  .calculator {
    width: 90%;
  }

  .manipulate-btns, .input-field {
    width: 80%;
  }

  .field {
    width: 82%;
  }

  .manipulate-btns button {
    width: 25%;
  }
}