styles.css

*{
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
    font-family: 'Ubuntu', sans-serif;
}
p{
    text-align: center;
    color: #F0E9E9;
    font-size: xx-large ;
}
body{
    width: 100%;
    height: 100vh;
    display: grid;
    place-items: center;
    background: linear-gradient(to left,#3A3845,#534340); 
}
.calc{
    border: 1px solid #DDBEBE;
    padding: 20px;
    border-radius: 18px;
    background: transparent;
    box-shadow: 0px 8px 20px rgb(179, 146, 146,0.5);
}
input{
    width: 340px;
    padding: 20px;
    border: none;
    background: transparent;
    font-size: 45px;
    text-align: right;
    cursor: pointer;
    color: #F0E9E9;
}
input::placeholder{
    color: #F0E9E9;
}
button{
    border: none;
    width: 60px;
    height: 60px;
    margin: 10px;
    border-radius: 50%;
    background: transparent;
    color: #F0E9E9;
    font-size: 22px;
    box-shadow: -5px -5px 10px rgba(192, 178, 176, 0.2);
    cursor: pointer;
}
.equal{
    background-color: #FF8303;
}
.sign{
    color: #76A21E;
}