*{
    margin : 0;
    padding : 0;
}

body{
    display: flex;
    justify-content: center; 
    align-items: center;
    background-color: rgb(247, 221, 196);
    min-height: 100vh;
    flex-direction: column;
}

.header{
    display: flex;
    flex-direction: column;
    text-align: center;
    margin : 1rem 1rem 1rem 1rem;
}

.welcome{
    background-color: rgb(7, 57, 102);
    width : 100vw;
    margin : 0 0 1rem 0;
}

h1{
    font-size: 4rem;
    color:rgb(138, 137, 137);
}

p{
    font-size: 1.5rem;
    color: rgb(7, 57, 102);
    font-weight: 700;
    font-family: 'Orbitron', sans-serif;
}

.calculator-container{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0.5rem 1rem 0.5rem 1rem;
    background-color: rgb(0, 0, 0);
    width:47vh;
    height:68vh;
    border-radius: 5%;
}

.screen{
    display: flex;
    justify-content: center; 
    align-items: center;     
    /* text-align: center; */
    margin : 0.1rem 0.5rem 0.5rem 0.5rem;
    width : 42vh;
    height : 6vh;
    background-color: rgba(61, 60, 60, 0.813);
    border-radius: 3%;
    color : rgb(182, 246, 79);
    padding : 0.2rem 0.2rem 0.2rem 0.2rem;
    font-size: 1.5rem;
}

.answer{
    display:flex;
    justify-content: center;
    height : 4vh;
    margin : 0.4rem 0.3rem 0.5rem 0.3rem;
    font-family: 'Orbitron', sans-serif;
}

.result{
    font-size: 1.8rem;
    color: rgba(121, 119, 119, 0.813);
    font-family: 'Courier New', Courier, monospace;
    font-weight: bold;
}

.value{
    color:#d11e1efd;
    font-size: 1.6rem;
    font-family: 'Orbitron', sans-serif;
}

hr{
    width: 45vh;
    color: rgb(61, 60, 60);
}

.key-pad{
    height : 45vh;
    width : 38vh;
    margin : 1rem;
    padding : 0.2rem 0.5rem 0.5rem 0.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.row{
    display: flex;
    justify-content: space-evenly;
    margin: 0.3rem;
}

button {
    width : 4rem;
    height : 4rem;
    border-radius: 50%;
    background-color: rgb(35, 35, 35);
    color: white;
    font-size: 1.4rem;
    cursor : pointer;
    transition: all 0.2s ease;
}

button:hover {
  background-color: #818080;
  transform: scale(1.05);
}

.grey{
    background-color: rgb(143, 142, 142);
    color : black;
}

.orange{
    background-color: rgb(226, 140, 26);
    color: white;
}

.grey:hover {
  background-color: #818080;
}

.orange:hover {
  background-color: #b96601;
}

#backspace:hover{
    background-color: #d11612;
}