body { background: #f4f7fc; }
main {
    display: table;
    width: 100%;
    height: 100vh;
}
#article {
    display: table-cell;
    vertical-align: middle;
}

.grid-container, .wrapper {
    width: 100%;
    max-width: 550px;
}

#login-block {
    background: #fff;
    border: 1px solid #ced4da;
    border-radius: 5px;
    padding: 2em;
}
#login-block img {
    display: block;
    margin: 0 auto;
}
#login-block input {
    width: 100%;
    box-sizing: border-box;
}
#login-block #login div:not(.phoneblock) { margin-top: 1em; }

#footer {
    margin-top: 0.5em;
    font-size: 0.95em;
}