dash-docs/_sass/_donation-banner.scss

$orange: #ef9e5b;
$dark-orange: #de8236;
$green: #4cad2c;
$dark-green: #318f20;

@mixin gradient($color1, $color2) {
    background-image: -o-linear-gradient(top, $color1 14%, $color2 70%);
    background-image: -moz-linear-gradient(top, $color1 14%, $color2 70%);
    background-image: -webkit-linear-gradient(top, $color1 14%, $color2 70%);
    background-image: -ms-linear-gradient(top, $color1 14%, $color2 70%);
    background-image: linear-gradient(top, $color1 14%, $color2 70%);
}

.donation-btn {
    background-color: #4CAF50;
    @include gradient($green, $dark-green);
    border: none;
    border-radius: 10px;
    padding: 10px 20px;
    color: white;
    font-weight: bold;
}

.donation-container {
    text-align: center;

    .donation-text {
        background-color: #ef9e5b;
        color: #ffffff;
        font-weight: bold;
        transition: margin-top .2s ease-in;
        height: 90px;
        margin-top: -110px;
        padding: 10px;

        &.expanded {
            margin-top: 0;
            border-bottom: 4px solid #ef9e5b;
            box-shadow: 0 7px 10px rgba(0, 0, 0, 0.22);
        }
    }

    .donation-visibility-toggle {
        cursor: pointer;
        display: inline-block;
        background-color: #ef9e5b;
        color: #fefefe;
        font-weight: bold;
        border: 4px solid #ef9e5b;
        border-top: 0;
        padding: 10px 50px;
        border-bottom-left-radius: 10px;
        border-bottom-right-radius: 10px;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.22);

        &.active {
            margin-top: -4px;
        }
    }
}

.donation-modal {
    background: white;
    padding: 0 20px;
    padding-bottom: 20px;
    position: absolute;
    top: 70px;
    right: 0;
    left: 0;
    z-index: 1000;
    max-width: 600px;
    margin: 0 auto;
    border-radius: 10px;
    transition: transform .2s ease-in, opacity .12s ease-in;
    transform-origin: top;

    &.hidden {
        transform: scale(0.7);
        opacity: 0;
    }

    &.open {
        transform: scale(1);
        opacity: 1;
    }

    .modal-close-btn {
        float: right;
        cursor: pointer;
        font-size: 200%;
        line-height: 16px;

        &:hover {
            color: #2c6fad;
        }
    }

    .modal-header-text {
        color: #383838;
        font-size: 110%;
        text-align: left;
        font-weight: bold;
        margin: 1em 0;
    }

    .modal-subheader {
        text-align: center;
        font-size: 16px;
        font-weight: bold;
        margin: 1.33em 0;
    }

    .donation-btc-address {
        text-align: center;
        font-size: 16px;
        font-weight: bold;
        margin: 1.33em 0;
        display: block;
        text-align: center;
    }

    .modal-body {
        .donation-amount-btn {
            cursor: pointer;
            background-color: #ef9e5b;
            @include gradient($orange, $dark-orange);
            border: none;
            border-radius: 10px;
            padding: 10px 20px;
            color: white;
            margin-right: 10px;
            font-weight: bold;

            &:hover {
                @include gradient($dark-orange, $orange);
            }

            .donation-amount-usd-in-btc {
                font-size: 75%;
            }
        }

        .donation-amount-input {
            width: 203px;
            margin-top: 15px;
            padding: 10px 15px;
            border: 2px solid #dadada;
            border-radius: 10px;
        }

        textarea.donation-amount-input {
            width: 460px;
            margin: 15px 0;
        }
    }
}

.modal-drop {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 101;
    background-color: rgba(0, 0, 0, 0.38);
    opacity: 0;
    transition: opacity .2s ease-in;
}

@media handheld, only screen and ( max-width: 60em ), only screen and ( max-device-width: 60em ){
    .donation-container {
        display: none;
    }
}