body {
    margin: 0px;
}

* {
    box-sizing: border-box;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
}

.container {
    padding: 16px;
}

.tb {
    width: 100%;
    padding: 12px 20px;
    margin: 8px 0;
    display: inline-block;
    border: 1px solid #ccc;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}

.login {
    margin: 20px auto;
    text-align: center;
    max-width: 300px;
    z-index: 1000;
    font-family: Calibri;
    font-size: 18px;
    padding: 10px;
    border: 3px solid #f1f1f1;
}