Ghost/ghost/admin/app/styles/layouts/auth.css

/* Authentication /ghost/[signin/signup/forgotten/reset]
/* ---------------------------------------------------------- */

.ghost-login,
.ghost-signup,
.ghost-forgotten,
.ghost-reset {
    color: var(--midgrey);
    background: var(--darkgrey);
}

.ghost-login main,
.ghost-signup main,
.ghost-forgotten main,
.ghost-reset main {
    padding-top: 15px;
}

.ghost-login input,
.ghost-signup input,
.ghost-forgotten input,
.ghost-reset input {
    line-height: 1.4em;
    font-size: 1.1em;
    font-weight: 200;
    border: none;
    color: #fff;
    background: color(var(--darkgrey) lightness(+10%));
    box-shadow: none;
    margin: 0;
    position: relative;
    transition: background ease 0.25s;
}

.ghost-login input:focus,
.ghost-signup input:focus,
.ghost-forgotten input:focus,
.ghost-reset input:focus {
    border: none;
    background: color(var(--darkgrey) lightness(+15%));
}

.ghost-login input:-webkit-autofill,
.ghost-signup input:-webkit-autofill,
.ghost-forgotten input:-webkit-autofill,
.ghost-reset input:-webkit-autofill {
    -webkit-box-shadow: 0 0 0 1000px var(--lightgrey) inset !important;
}

.login-box,
.signup-box,
.forgotten-box,
.reset-box {
    display: table;
    max-width: 530px;
    height: 90%;
    margin: 0 auto;
    padding: 0;
}

@media (max-width: 630px) {
    .login-box,
    .signup-box,
    .forgotten-box,
    .reset-box {
        max-width: 264px;
        text-align: center;
    }
}


/* Sign in
/* ---------------------------------------------------------- */

.login-form {
    max-width: 530px;
    color: color(var(--midgrey) lightness(+15%));
    display: table-cell;
    vertical-align: middle;
}

@media (max-width: 630px) {
    .login-form {
        max-width: 264px;
    }
}

.login-form .email-wrap,
.login-form .password-wrap {
    position: relative;
    margin: 0 0 5px 0;
    float: left;
}

@media (max-width: 630px) {
    .login-form .email-wrap,
    .login-form .password-wrap {
        margin-bottom: 1em;
    }
}

.login-form .email-wrap {
    margin-right: 3px;
}

@media (max-width: 630px) {
    .login-form .email-wrap {
        margin-right: 0;
    }
}

.login-form .email,
.login-form .password {
    display: inline-block;
    clear: both;
    padding: 8px 0 8px 8px;
    width: 216px;
}

@media (max-width: 630px) {
    .login-form .email,
    .login-form .password {
        width: 264px;
        border-radius: 2px;
    }
}

@media (min-width: 631px) {
    .login-form .email {
        border-radius: 2px 0 0 2px;
    }
    .login-form .password {
        border-radius: 0 2px 2px 0;
    }
}

.login-form button {
    width: 85px;
    height: 37px;
    margin-left: 10px;
}

@media (max-width: 630px) {
    .login-form button {
        margin: 0;
        width: 100%;
        margin-bottom: 1em;
    }
}

.login-form .meta {
    clear: both;
    color: var(--midgrey);
}

.login-form .forgotten-link {
    display: inline-block;
    height: auto;
    width: auto;
    margin: 0;
    padding: 0;
    font-size: 1.25rem;
    color: color(var(--midgrey) lightness(-10%));
    text-transform: none;
    letter-spacing: 0;
}

.login-form a {
    color: color(var(--midgrey) lightness(-10%));
    font-size: 0.9em;
}

.login-form a:hover {
    color: color(var(--midgrey) lightness(+5%));
    text-decoration: none;
}


/* Signup / Reset Password
/* ---------------------------------------------------------- */

.signup-form,
.reset-form {
    max-width: 280px;
    color: color(var(--midgrey) lightness(+15%));
    display: table-cell;
    vertical-align: middle;
}

@media (max-width: 630px) {
    .signup-form,
    .reset-form {
        width: 264px;
    }
}

.signup-form .password-wrap,
.reset-form .password-wrap {
    position: relative;
    margin: 0 0 1em 0;
    background: color(var(--darkgrey) lightness(+10%));
    float: left;
    display: table;
}

.signup-form input,
.reset-form input {
    width: 280px;
    padding: 8px 10px;
}

@media (max-width: 630px) {
    .signup-form input,
    .reset-form input {
        width: 264px;
    }
}

.signup-form .name-wrap,
.reset-form .name-wrap {
    position: relative;
    border-radius: 2px;
}

.signup-form .name,
.reset-form .name {
    border-radius: 2px;
}

.signup-form .email-wrap,
.reset-form .email-wrap {
    position: relative;
    border-radius: 2px;
}

.signup-form .email,
.reset-form .email {
    border-radius: 2px;
}

.signup-form .password-wrap,
.reset-form .password-wrap {
    position: relative;
    border-radius: 2px;
}

.signup-form .password,
.reset-form .password {
    border-radius: 2px;
}

.signup-form button,
.reset-form button {
    width: 100%;
    height: 36px;
    margin: 0 0 1em 0;
    padding: 0.5em 1.37em;
    min-height: 30px;
    min-width: 80px;
    box-shadow: rgba(255, 255, 255, 0.15) 0 1px 0 inset;
}


/* Forgotten password
/* ---------------------------------------------------------- */

.forgotten-form {
    max-width: 280px;
    color: color(var(--midgrey) lightness(+15%));
    display: table-cell;
    vertical-align: middle;
}

.forgotten-form .email-wrap {
    position: relative;
    margin: 0 0 1em 0;
    float: left;
    border-radius: 2px;
    width: 100%;
}

.forgotten-form .email {
    padding: 8px 10px;
    border-radius: 2px;
}

.forgotten-form button {
    width: 100%;
    height: 37px;
}

.private-login h1 {
    margin-bottom: 2rem;
    text-indent: 0;
}
.private-login .form-group {
    margin: 0;
}
.private-login input[type="password"] {
    padding: 9px 7px;
    border-radius: 3px 3px 0 0;
}
.private-login-button {
    padding: 9px 1.8em;
    border-radius: 0 0 3px 3px;
}