*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
    font-weight: bold
}

body{
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: url(nature.jpg);
    background-size: cover;


}
.container{
    padding: 20px;
    border: 2px solid black;
    border-radius: 16px;
    box-shadow: 0px 3px 15px rgba(0, 0, 0, 0.8);
    background: rgba(0, 0, 0, 0.5);
}
input{
    width: 320px;
    padding: 24px;
    margin: 10px;
    background: rgb(225, 225, 225, 0.5);
    box-shadow: inset 0px 0px 8px rgba(0, 0, 0, 0.4);
    font-size: 50px;
    text-align: right;
    color: #fff;
    border: solid rgba(0, 0, 0, 0.3);
    border-radius: 16px;
    text-shadow: 0px 1px 5px rgba(0, 0, 0, 0.2);
}
input::placeholder{
    color: #fff;
    
}
button{
    width: 60px;
    height: 60px;
    margin: 10px;
    color: #fff;
    background: rgba(0, 0, 0, 0.7);
    font-size: 22px;
    border: solid rgba(255, 255, 255, 0.2);
    border-radius: 15px;
    text-shadow: 0px 1px 5px rgba(0, 0, 0, 0.2);
    box-shadow: -1px 2px 10px rgba(0, 0, 0, 0.5);
}
.ac, del{
    font-size: 24px;
}
button:hover{
    color: #fff;
    background: #f67c14;
}
.equalbtn{
    background: #f67c14;
}
.operator{
    color:  #f67c14;
}

@media (max-width: 480px) {
  input {
    font-size: 26px;
    padding: 15px;
  }
  button {
    font-size: 18px;
  }
}