simple-images-upload/sass/modal.scss

.modal {
    bottom: 0;
    left: 0;
    right: 0;
    top: 0;
    align-items: center;
    display: none;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
    position: fixed;
    z-index: 40;

    &.is-visible {
        display: flex;
    }

    .modal-background {
        background-color: rgba(10,10,10,.86);
        bottom: 0;
        left: 0;
        position: absolute;
        right: 0;
        top: 0;
    }

    button.close {
        user-select: none;
        background-color: rgba(10,10,10,.2);
        border: none;
        border-radius: 9999px;
        cursor: pointer;
        pointer-events: auto;
        display: inline-block;
        flex-grow: 0;
        flex-shrink: 0;
        font-size: 0;
        height: 20px;
        max-height: 20px;
        max-width: 20px;
        min-height: 20px;
        min-width: 20px;
        outline: none;
        position: relative;
        width: 20px;

        &::before,
        &::after {
            background-color: var(--default-color);
            content: "";
            display: block;
            left: 50%;
            position: absolute;
            top: 50%;
            transform: translateX(-50%) translateY(-50%) rotate(45deg);
            transform-origin: center center;
        }
        &::before {
            height: 2px;
            width: 50%;
        }
        &::after {
            height: 50%;
            width: 2px;
        }
    }

    .modal-card {
        position: relative;
        width: 300px;
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        max-height: calc(100vh - 40px);
        overflow: hidden;

        @include respond-to("small-up") {
            width: 560px;
        }
        @include respond-to("medium-up") {
            width: 980px;
        }
        @include respond-to("large-up") {
            width: 1200;
        }

        header,
        footer {
            align-items: center;
            background-color: var(--navbar-color);
            display: flex;
            flex-shrink: 0;
            justify-content: flex-start;
            padding: 0.75rem;
            position: relative;
            @include transition() {}
        }

        header {
            border-bottom: 1px solid var(--border-color);
            border-top-left-radius: 6px;
            border-top-right-radius: 6px;
            justify-content: space-between;
            font-size: 1.5rem;
            @include transition() {}
        }
        .body {
            background-color: var(--default-color);
            flex-grow: 1;
            flex-shrink: 1;
            overflow: auto;
            padding: 20px;
            @include transition() {}
        }
        footer {
            border-bottom-left-radius: 6px;
            border-bottom-right-radius: 6px;
            border-top: 1px solid var(--border-color);

            .button:not(:last-child) {
                margin-right: .5em;
            }
        }
    }
}