:root {
  --clr-primary:rgb(54, 112, 191);
  --clr-secondary:#fff;
  --clr-calculate:#3af9ff;
  --clr-calculator:#3a4452;
  --clr-dark:#333;
  --clr-text:rgb(199, 36, 36);
}


* {
  margin: 0;
  padding:0;
  box-sizing: 0;
}

body {
  font-family: "Roboto";
  font-weight: 500;
  font-size: 1em;
  background: var(--clr-primary);
}

.container {
  background-color: var(--clr-primary);
  width: 100%;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;

}

.calculator {
  background: var(--clr-calculator);
  padding: 20px;
  border: 0;
  border-radius: 20px; 
}

.calculator form input {
  border: 0;
  outline: 0;
  width: 50px;
  height: 50px;
  border-radius: 10px;
  box-shadow: -8px -8px 15px rgba(255, 255, 255, 0.1),5px 5px 15px rgba(0, 0, 0, 0.2) ;
  background: transparent;
  color: var(--clr-secondary);
  font-size: 1em;
  font-weight: 700;
  cursor: pointer;
  margin: 10px;
  
}

form .text-input {
  display: flex;
  justify-content: flex-end;
  margin: 10px 0;
}

form .text-input input  {
  display: flex;
  flex: 1;
  text-align: right;
  box-shadow: none;
  border: 5px solid var(--clr-primary);
  font-size: 2em;
}

form input.equal{
  width: 120px;
}

form .btn.smart {
  color: var(--clr-text);
}