body.bg-dark {
    background: #181a20 !important;
    color: #e0e0e0 !important;
}
.table-dark {
    background: #23272f !important;
    color: #e0e0e0 !important;
}
.form-control {
    background: #23272f !important;
    color: #e0e0e0 !important;
    border: 1px solid #444;
}
.btn-primary, .btn-success {
    background: linear-gradient(90deg, #3a3f51 0%, #23272f 100%);
    border: none;
    color: #fff;
}
.btn-danger {
    background: #c0392b !important;
    border: none;
}
input[type="checkbox"] {
    accent-color: #3a3f51;
}
hr {
    border-color: #444;
}
.alert-success {
    background: #23272f;
    color: #27ae60;
    border: 1px solid #27ae60;
}
h2, h4 {
    color: #fff;
}

.form-control::placeholder {
    color: #b0b0b0 !important;
    opacity: 1;
}
.form-control:-ms-input-placeholder { /* IE 10-11 */
    color: #b0b0b0 !important;
}
.form-control::-ms-input-placeholder { /* Edge */
    color: #b0b0b0 !important;
}