.sms-error {
    background: #ffe6e6;
    border-left: 4px solid #cc0000;
    padding: 15px;
    margin-bottom: 20px;
}
.wrap {
    max-width: 800px;
    margin: 0 auto;
}
.wrap h1 {
    font-size: 24px;
    margin-bottom: 20px;
}
.wrap h2 {
    font-size: 20px;
    margin-top: 30px;
    margin-bottom: 15px;
}
.wrap form {
    margin-bottom: 20px;
}
.wrap input[type="text"],
.wrap input[type="number"],
.wrap textarea,
.wrap select {
    width: 100%;
    max-width: 400px;
    padding: 8px;
    margin-bottom: 10px;
}
.wrap input[type="file"] {
    margin-bottom: 10px;
}
.wrap .button {
    padding: 10px 20px;
    background: #0073aa;
    color: #fff;
    border: none;
    cursor: pointer;
}
.wrap .button-secondary {
    background: #6c757d;
}
.wrap .button-small {
    padding: 5px 10px;
    font-size: 12px;
}
.wrap table.widefat {
    width: 100%;
    border-collapse: collapse;
}
.wrap table.widefat th,
.wrap table.widefat td {
    padding: 10px;
    border: 1px solid #ddd;
}
.wrap .tablenav {
    margin-top: 15px;
}
.nav-tab-wrapper {
    margin-bottom: 20px;
}
.nav-tab {
    padding: 8px 15px;
    margin-right: 5px;
    background: #f1f1f1;
    text-decoration: none;
}
.nav-tab-active {
    background: #0073aa;
    color: #fff;
}