.error-block {
    position: fixed;
    top: 10px;
    right: 10px;
    z-index: 50;
    background: red;
    color: white;
    font-weight: bolder;
}

.success-block {
    position: fixed;
    top: 10px;
    right: 10px;
    z-index: 50;
    background: green;
    color: white;
    font-weight: bolder;
}