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

body{
    height: 100vh;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgb(9, 52, 30);
    font-family: 'Fira Sans Extra Condensed', sans-serif;
}

.container{
    color: #ffff;
    width: 350px;
    min-height: 80vh;
    border-radius: 30px;
    background-color: 	black;
    box-shadow: 5px 5px 10px #b6acac, -5px -5px 10px #ffff;
}

.nav{
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 30px 25px;

    }

    i{
        cursor: pointer;
    }

.output {
    height: 3em;
    margin-top: 30px;
    text-align: right;
    display: grid;
    align-items: center;
    color: white;
    font-size: 2rem;
    padding-right: 25px;
    font-weight: 700;
    word-wrap: break-word;
}

#btn-container {
    display: grid;
    grid-template: repeat(4, 1fr) / repeat(4, 1fr);
    padding: 20px 20px;
    margin-top: 40px;
    gap: 20px;
}

.button{
    padding: 1rem;
    border-radius: 70px;
    text-align: center;
    background-color:  #1e1e1e;
    font-weight: 700;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
}

.btn-0 {
    grid-column: 1/3;
    border-radius: 10px;
}

.button:hover {
    background-color: rgb(9, 52, 30);
}

.button:active{
    background-color: #152238;
}

.btn-0 {
    grid-column: 1/3;
    border-radius: 10px;
}

.equal{
    background-color: rgb(16, 215, 112);
}

.operation{
    color: rgb(16, 215, 112);
}



@media screen and (min-width: 500px) {
.output {
    height: 3em;
    margin-top: 0px;
}

#btn-container {
    margin-top: 0px;
    gap: 10px;
}

}
@media screen and (min-width: 1440px) {
    .output {
        height: 6em;
        margin-top: 0px;
    }
    
    #btn-container {
        padding-top: 10px;
        gap: 15px;
    }
}