button {
    margin: 0;
    /* 明示的にリセット */
    padding: 10px 10px;
    min-width: 100px;
}

.auth-container {
    max-width: 400px;
}

.btn-yellow {
    background-color: #B00000;
    color: #ffffff;
    border: none;
    min-width: 100px;
}

.btn-yellow:hover {
    background-color: #860000;
}

.btn-yellow:active {
    background-color: #860000;
}

.forgot-btn {
    display: block;
    margin: auto;
    margin-top: 1rem;
    margin-bottom: 2rem;
    padding: 1rem 1.5rem;
}

#promise {
    height: 80px;
}

@media screen and (min-width: 768px) {

    .form-label,
    label,
    input,
    select,
    .btn,
    .form-select,
    .form-control,
    * {
        font-size: 1.3rem;
    }

    a {
        font-size: 1rem;
    }

    button {
        margin: 0;
        /* 明示的にリセット */
        padding: 10px 20px;
        min-width: 130px;
    }

    .btn-yellow {
        min-width: 130px;
    }


    .auth-container {
        max-width: 500px;
        padding: 0 20px;
    }

}