body {  
        margin: 0;
        height: 100vh;
        display: flex;
        justify-content: center;
        align-items: center;
        background-color: lightblue;
}

h1 {
    text-decoration:black underline dotted;
    color: green;
    text-align:center;
}

.input-box {
    width: 300px;
    height: 35px;
    padding: 6px 10px;
    font-size: 14px;
    border: 1px solid #000000;
    border-radius: 10px;
    box-sizing: border-box;
}

#username {

    width: 300px;
    height: 35px;
    padding: 6px 10px;
    font-size: 14px;
    border: 2px solid #000;
    border-radius: 10px;
    box-sizing: border-box;

}

#age {
    width: 300px;
    height: 35px;
    padding: 6px 10px;
    font-size: 14px;
    border: 2px solid #000;
    border-radius: 10px;
    box-sizing: border-box;
}

#email {
    width: 300px;
    height: 35px;
    padding: 6px 10px;
    font-size: 14px;
    border: 2px solid #000;
    border-radius: 10px;
    box-sizing: border-box;
}

button {
    color: white;
}

#Sub {
    background-color: blue;
    width: 300px;
    height: 35px;
    padding: 6px 10px;
    font-size: 14px;
    border: 1px solid #777;
    border-radius: 10px;
    box-sizing: border-box;
}

#res {
    background-color: red;
    width: 300px;
    height: 35px;
    padding: 6px 10px;
    font-size: 14px;
    border: 1px solid #777;
    border-radius: 10px;
    box-sizing: border-box;
}

.container {
    border: 2px solid black;
    padding: 20px;
    border-radius: 15px;
}