style.css

*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: "Nunito",serif;
}
.container{
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    background-color: rgb(15, 4, 63)
}
.container .box{
    width: 400px;
    height: 300px;
    border: 1px solid black;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    background-color: #ddd;
    border-radius: 6px;
}
.container .box h2{
    font-size: 30px;
    margin-bottom: 1.2rem;
    color: rgb(10, 0, 0);

}
 .box .result{
    color: rebeccapurple;
    font-weight: 700;
    margin-bottom: 2.2rem;
    border: 2px dashed rgb(8, 8, 8);
    padding: 4px 20px;
    font-size: 20px;
    

}
.box button{
    outline: none;
    padding: 12px 40px;
    background-color: green;
    color: white;
    border: none;
    font-size: 20px;
    cursor: pointer;
    transition: .5s ease-in-out;

}
.box button:hover{
     background-color:#030953;
    
 ;
}