@import url('https://fonts.googleapis.com/css2?family=Lato:ital,wght@0,300;0,400;0,700;1,400&family=Nova+Square&family=Nunito+Sans:opsz,wght@6..12,200;6..12,300;6..12,400;6..12,500;6..12,600;6..12,700&family=Open+Sans:wght@400;600;700&family=Orbitron:wght@400;500;600;700&family=Roboto+Condensed:wght@300;400;700&family=Varela+Round&display=swap');

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

body{
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(45deg, #0a0a0a, #3a4452);
}

.calculator{
    height: 660px;
    width: 410px;
    border: 1px solid #fff;
    border-radius: 16px;
    padding: 30px;
    background: transparent;
    box-shadow: 0px 0px 30px rgba(0,0,0,0.9);
    
}

input{
    width: 100%;
    height: 10vh;
    padding: 15px;
    font-size: 30px;
    text-align: right;
    background: transparent;
    color: #fff;
    cursor: pointer;
    margin-bottom: 20px;
}

input::placeholder{
    color: #fff;
}

button{
    height: 65px;
    width: 65px;
    margin: 8px;
    font-size: 20px;
    border-radius: 50%;
    background-color: transparent;
    border: none;
    box-shadow: 0px 0px 30px rgba(0,0,0,0.9);
    color: #fff;
    cursor: pointer;
}

button:hover{
    background-color: rgba(128, 128, 128, 0.325);
}

button:active{
    background-color: black;
}

.operator{
    color: green;
}

#equals{
    background-color: orange;
}

@media screen and (max-width: 450px) {
    
    .calculator{
        height: 550px;
        width: 350px;
    }
    button{
        width: 50px;
        height: 50px;
    }
}

@media screen and (max-width: 350px) {
    
    .calculator{
        height: 480px;
        width: 300px;
    }
    button{
        width: 35px;
        height: 35px;
    }
}

@media screen and (max-width: 300px) {
    
    .calculator{
        height: 450px;
        width: 280px;
    }
    button{
        width: 33px;
        height: 33px;
    }
}