Form loses style upon validation process

[eluser]John Lopez[/eluser]
Oh yeah, the CSS: (with webkit only for now)

Code:

body {
    background: #fff;
    margin: auto;
    font: normal 14px Verdana, sans-serif;
    color: #777777;
}

h1 {
    color: #6c6c6c;
    background: transparent;
    border-bottom: 1px solid #6c6c6c;
    font: bold 16px;
    margin: 24px 0 24px 0;
    padding: 5px 0 5px 0;
}

input {
    display: block;
    margin: 9px 15px;
    width: 250px;
}

.input_field {
    padding: 5px 10px;  
    -webkit-border-radius: 4px;
    border: 1px solid #efefef;
    color: #7c7c7c;
}

.input_field:hover{
    border: 1px solid #e1e1e1;
    background: #efefef;
}

#submit {
    padding: 5px 10px;
    margin: 9px 15px;
    width: 250px;
    background: #333;
    color: #fff;
    font-weight: bold;
    border: 1px #333;
    -webkit-border-radius: 4px;
}

#submit:hover {
    background: #676767;
    cursor: pointer;
}