style.css

body{
    width: 100%;
    height: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    /*background:linear-gradient(45deg,#3b2aaa,#b7bdaf); */
}
table{
    border: 4px solid rgb(46, 22, 180);
    background-color: rgb(189, 189, 205);
    align-items: center;
    width: 500px;
    border-radius: 18px;
    text-align: center;
    padding: 20px;
}
.btn{
    width: px;
    height: 40px;
    border: 4px solid rgb(35, 16, 5);
    border-radius: 40px;
    text-align: center;
    font-size: 18px;   
    margin-top: 10px;
    margin-bottom: 10px;
    background-color: #ff0c0c;
    color: rgb(0, 0, 0);
    /* border: none; */    
}
.btn:hover{
    background-color: #56ef4e;
    color: rgb(0, 0, 0);
}
.display{
    width: 280px;
    height: 35px;
    text-align: center;
    margin-top: 15px;
    font-size: 20px;
    background-color: rgb(0, 0, 0);
    color: white;
    border: 1px solid white;
    /* border-radius: 7px; */
}
.input{
    width: 280px;
    height: 35px;
    text-align: center;
    margin-top: 15px;
    font-size: 20px;
    background-color: rgb(0, 0, 0);
    color: white;
    border: 1px solid white;
    /* border-radius: 7px; */
}