body.login {
background: #000000!important;
}
.login h1 a {
background-image: url('../your_logo/login-logo.png');
background-size: 320px 135px;
width: 320px;
height: 135px;
}
#loginform {
background: transparent;
margin-top: 40px!important;
}
.login label {
color: #fff;
font-size: 14px;
}

.wp-core-ui .button.button-large {
    height: 30px;
    line-height: 28px;
    padding: 0 12px 2px;
    text-shadow: none;

/* CUSTOM THEME SPECIFICS */
.login #backtoblog a, .login #nav a {
color: #FFFFFF!important;
}
.login #backtoblog a:hover, .login #nav a:hover, .login h1 a:hover {
color: #8A8A8A!important;
}
.login label {
color: #636363!important;
}

/* BUTTONS */
.wp-core-ui .button-primary {
background: #2C2C2C!important;
border-color: #2C2C2C!important;
-webkit-box-shadow: none!important;
box-shadow: none!important;
text-shadow:none !important;
}
.wp-core-ui .button-primary.hover, .wp-core-ui .button-primary:hover, .wp-core-ui .button-primary.focus, .wp-core-ui .button-primary:focus {
background: #868686!important;
border-color: #7C7C7C!important;
-webkit-box-shadow: inset 0 1px 0 rgba(77, 77, 77, 0.6)!important;
box-shadow: inset 0 1px 0 rgba(68, 68, 68, 0.6)!important;
color: #fff;
}

body input[type=text] {
    background: transparent !important;
    color: #fff;
    font-weight: 100;
    font-size: 16px;
    padding: 10px;
    border-color: rgba(255, 255, 255, 0.33);
}