one.css

.input, textarea, .button {
    display: block;
    padding: 8px;
    margin-bottom: 10px;
    box-sizing: border-box; /* Ensure padding doesn't affect width */
}
.input{
    box-shadow: rgba(99, 99, 99, 0.2) 0px 2px 8px 0px;
    border:none;
}
.table{
    width: 100%;
    max-width: 500px;
    margin: 0 auto; /*centers the table*/
    border-collapse: collapse; /*removes space between table cells*/
    font-family:Arial, Helvetica, sans-serif;
    font-size: 14px;
    font-weight: bold;
    box-shadow: rgba(0, 0, 0, 0.15) 0px 5px 15px 0px;
    border-radius: 10px;
    background-color: white;
}
.data{
    padding: 10px;
    margin: 5px;
    vertical-align: top;
}
.button{
    background-color: rgb(34, 202, 34);
    color: white;
    border: none;
    padding: 10px;
    cursor: pointer;
    border-radius: 5px;
}
.label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}
.heading{
    text-align: center;
    margin-top: 5px;
    padding: 10px;
    text-transform: uppercase;
}
/* Center the h1 and span across all columns (optional) */
.data[colspan="2"] {
    text-align: center; /* Ensure the h1 is centered inside the full-width cell */
}
/*modifying the input of name*/
.input #name:invalid:focus{
    border: 1px solid red;
}