index.css

*,*::before,*::after{
    box-sizing: border-box;
    font-family: Gotham Rounded, sans-serif;
    font-weight: normal;

}

body{
    padding: 0%;
    margin: 0%;
    background: linear-gradient(to right,#a3b1b9,#515f63);
  

}
.calculator-grid{
    display: grid;
    align-content: center;
    justify-content: center;
    min-height: 100vh;
    grid-template-columns: repeat(4, 100px);
    grid-template-rows: minmax(120px, auto) repeat(5, 100px);
}
.calculator-grid> button{
    cursor: pointer;
    font-size: 2rem;
    border: 1px solid rgb(212, 205, 205);
    outline: none;
    background-color: rgba(192, 191, 191, 0.75);

}
.calculator-grid> button:hover{
    background-color: rgba(255, 255, 255, .9);
}
    
.span-two{
    grid-column: span 2;
}
.outputscreen{
    grid-column: 1/-1;
    background-color: rgba(0, 0, 0, 0.75);
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    flex-direction: column;
    padding: 10px;
    word-wrap: break-word;
    word-break: break-all;
}
.previous-operation{
    color: rgba(255, 255, 255, .75);
    font-size: 1.5rem;
    

}

.current-operation{
    color: white;
    font-size: 2.5rem;

}
@media screen and (max-width: 600px){
    
}