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

body {
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-image: url('https://images.pexels.com/photos/1459/street-car-vehicle-blur.jpg');
    background-repeat: no-repeat;
    background-size: cover;
}

.calculator {
    border: 2px solid #717377;
    padding: 20px;
    border-radius: 20px;
    background: rgb(0, 0, 17);
    box-shadow: 0px 3px 15px rgb(87, 202, 240);
}

h1 {
  color: #00eaff;
  margin-bottom: 15px;
  font-size: 28px;
  text-align: center;
}

input {
  width: 100%;
  border: none;
  padding: 20px;
  margin-bottom: 20px;
  background: #2a2a3d;
  border-radius: 10px;
  font-size: 28px;
  text-align: right;
  color: #fff;
  outline: none;
  box-shadow: inset 0px 3px 8px rgba(0,0,0,0.5);
}

input::placeholder {
  color: #aaa;
}

.row {
  display: flex;
  justify-content: space-between;
}

button {
  border: none;
    width: 60px;
    height: 60px;
    margin: 10px;
    border-radius: 50%;
    background: transparent;
    color: white;
    font-size: 20px;
    box-shadow: -8px -8px 15px rgba(255,255,255,0.1);
    cursor: pointer; 
}

button:hover {
  background: #50507a;
  transform: scale(1.05);
}

.operator {
  background: #2b7a78;
  color: #fff;
  font-weight: bold;
}

.operator1 {
  background: #2b7a78;
  color: #fff;
  font-weight: bold;
}


.operator:hover {
  background: #3fa9a2;
}

.equalBtn {
  background: #e67e22;
  color: white;
  font-size: 22px;
}

.equalBtn:hover {
  background: #ff8c42;
}

.dropdown {
  position: relative;
  display: inline-block;
}


.dropdown-content {
  display: none;
  position: absolute;
  top: 70px;  
  left: 0;
  background: #2a2a3d;
  border-radius: 10px;
  padding: 5px;
  box-shadow: 0px 3px 10px rgba(0,0,0,0.4);
}

.dropdown-content button {
  display: block;
  width: 50px;
  height: 40px;
  margin: 5px auto;
  border-radius: 8px;
  font-size: 18px;
}

.dropdown:hover .dropdown-content {
  display: block;
}