.admin-form {
    width: 97%;
    margin: 0 auto 10px;
    padding: 25px;
    background-color: rgba(0, 0, 0, 0.3);
    box-shadow: 0 0 5px #00994d;
    border-radius: 5px;
    display: flex;
    justify-content: center;
    font-size: 18px;
}
    .admin-form form {
        background: linear-gradient(
            to left,
            rgba(255, 255, 255, 0.05),
            rgba(255, 255, 255, 0.35)
        );
        box-shadow: 0 8px 24px 0 rgba(0, 0, 0, 0.3);
        border-radius: 10px;
        max-width: 300px;
        padding: 20px 15px;
        text-align: center;
    }
        form .form__icon {
            margin: 0 auto 15px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
            .form__icon i {
                font-size: 76px;
                color: rgba(255, 255, 255, 0.9);
                text-shadow: 0 0 5px #000;
            }
        form .form__input-container {
            position: relative;
            margin-bottom: 20px;
        }
            .form__input-container input,
            form button {
                background: linear-gradient(
                    to left,
                    rgba(255, 255, 255, 0.1),
                    rgba(255, 255, 255, 0.25)
                );
                border: none;
                border-radius: 5px;
                box-shadow: 0 8px 24px 0 rgba(0, 0, 0, 0.3);
                color: rgb(255, 255, 255);
                font-size: 18px;
                padding: 10px 15px;
                transition: box-shadow 0.3s, outline 0.3s;
            }
                .form__input-container input:hover,
                form button:hover {
                    box-shadow: 0 8px 12px 0 rgba(0, 0, 0, 0.3);
                }
                .form__input-container input:focus,
                form button:focus {
                    outline: solid 2px rgba(255, 255, 255, 0.8);
                }
            .form__input-container input {
                width: 100%;
            }
            .form__input-container label {
                color: rgb(255, 255, 255);
                position: absolute;
                left: 15px;
                top: 50%;
                transform: translateY(-50%);
                opacity: 1;
                transition: left 0.3s, opacity 0.3s;
                font-style: italic;
                cursor: text;
            }
            .form__input-container input:focus + label,
            .form__input-container input:not(:placeholder-shown) + label {
                left: 100px;
                opacity: 0;
            }
        form .form__spacer {
            background: rgba(255, 255, 255, 0.55);
            height: 2px;
            margin: 0 auto 20px;
            width: 85%;
        }
        form button {
            cursor: pointer;
        }

.error-message {
    color: #f00;
    margin-bottom: 25px;
    text-shadow: 2px 2px 3px #000;
    text-transform: uppercase;
}

@media (max-width: 768px) {
    .form__icon i {
        font-size: 56px;
    }
    .form__input-container input,
    form button {
        font-size: 14px;
        padding: 8px 10px;
    }
        .form__input-container input:focus + label,
        .form__input-container input:not(:placeholder-shown) + label {
            left: 100px;
        }
    form button {
        width: 60%;
        font-size: 16px;
    }
    .error-message {
        font-size: 14px;
        text-shadow: 1px 1px 2px #000;
    }
}