styles.css

/* global vars */
:root {
    --bg-color: #9A8C98;
    --white-key-color: #F2E9E4;
    --white-key-active-color: #C9ADA7;
    --black-key-color: #22223B;
    --black-key-active-color: #4A4E69;
}

/* https://coolors.co/22223b-4a4e69-9a8c98-c9ada7-f2e9e4 */

/*=================================================================*/
/* These are dark mode-related properties
/* main page background color */
body {
    background-color: var(--bg-color);
}

/* navbar and footer stuff*/
.navbar, footer {
    background-color: var(--black-key-color);
}

.navbar-brand, footer div, footer a {
    color: var(--white-key-color);
}

/* toggle options */
.toggles {
    color: var(--black-key-color);
}

/*=================================================================*/
/* Dark mode switch*/
#dark-label {
    color: var(--bs-navbar-color);
}

#dark-switch:focus {
    border-color: var(--bs-success);
    outline: 0;
    box-shadow: 0 0 0 0 rgba(0, 0, 0, 0);
}

#dark-switch:checked {
    background-color: var(--bs-success);
    border-color: var(--bs-success);
}

/*=================================================================*/
/* main area has a 5vw padding LR*/
main {
    padding: 0 5vw;
}

/*=================================================================*/
/* button and select group */
.buttons {
    width: 50%;
}

.btn-group-vertical {
    height: 100% !important;
}

.btn {
    color: var(--white-key-color);
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
    border-bottom-left-radius: 0px;
    border-bottom-right-radius: 0px;
}

.btn-warning {
    color: var(--black-key-color);
}

select {
    background-color: var(--white-key-color) !important;
    border-top-left-radius: 0 !important;
    border-top-right-radius: 0 !important;
    border-bottom-left-radius: 5px !important;
    border-bottom-right-radius: 5px !important;
}

#answer {
    border-top-left-radius: 0 !important;
    border-top-right-radius: 0 !important;
    border-bottom-left-radius: 5px !important;
    border-bottom-right-radius: 5px !important;
    pointer-events: auto;
}

/*=================================================================*/
/* feedback area */
.feedback {
    text-align: center;
    background-color: var(--white-key-color);
    width: 50%;
    border-radius: 5px;
    border: 1px solid var(--black-key-color);
}

/*=================================================================*/
/* piano frame aka container */
.piano {
    position: relative;
    overflow: auto;
    white-space: nowrap;
    font-size: 0;
}

/* piano keys */
.key {
    border-bottom-left-radius: 10px;
    border-bottom-right-radius: 10px;
    cursor: pointer;
    position: relative;
    text-align: center;
    display: inline-block;
    font-size: 1vw;
    box-shadow: 0 5px 8px 0 rgba(0, 0, 0, 0.2);
    user-select: none;
    -webkit-touch-callout: none; /* iOS Safari no select */
    -webkit-user-select: none;
}

/* Black and white key design */
.white {
    /* white key is about 1.75 the size of black key */
    width: 5.9vw;
    height: 20vw;
    background-color: var(--white-key-color);
    border: 1px solid var(--black-key-color);
    color: var(--black-key-color);
}

.white.active {
    background-color: var(--white-key-active-color);
}

.black {
    width: 3vw;
    height: 11.5vw; 
    margin: 0 -1.5vw;
    background-color: var(--black-key-color);
    color: var(--white-key-color);
    z-index: 1;
}

.black.active {
    background-color: var(--black-key-active-color);
}

/*=================================================================*/
/* Toggles */
.form-check-input {
    background-color: var(--white-key-color);
}

.form-check-input:checked {
    background-color: var(--bs-blue);
}

/*=================================================================*/
#about {
    text-align: justify !important;
    width: 75%;
}

/*=================================================================*/
#contact-form {
    color: var(--black-key-color);
    background-color: var(--white-key-color);
    border-radius: 5px;
    width: 75%;
    border: 1px solid var(--black-key-color);
}

#contact-submit {
    border-radius: 5px;
}

#form-name, #form-lastname, #form-email, #form-message {
    color: var(--black-key-color);
    background-color: var(--white-key-color);
    border: 1px solid var(--black-key-active-color);
}

/*=================================================================*/
/* Responsive design when screen too small*/
@media screen and (max-width: 768px) {
    .piano {
        border-radius: 10px;
        border: 7px solid var(--white-key-color);
        /* background-color: var(--black-key-color); */
    }

    .key {
        font-size: 0.75rem;
    }

    /* white key is 1.75 the size of black key */
    .white {
        width: 60px;
        height: 270px;
    }

    .black {
        width: 36px;
        height: 162px; 
        margin: 0 -18px; /* LR margin is half the size of width */
    }

    #scroll {
        display: block;
        text-align: center;
        font-size: 1rem;
        /* color: var(--bg-color); */
        position: sticky;
        left: 0;
    }

    .buttons, .feedback {
        width: 100%;
    }

    #about {
        width: 100%;
    }

    #contact-form {
        width: 100%;
    }
}