.modal {
    position: fixed;
    top: -100%;
    left: -100%;
    opacity: 0;
    width: 100%;
    height: 100%;
    overflow-x: hidden;
    overflow-y: auto;
    outline: 0;

    background-color: rgba(0, 0, 0, .5);
    z-index: 99;
    transition: opacity .5s;
}

.modal.active {
    left: 0;
    top: 0;
    opacity: 1;
}

.modal-dialog {
    position: relative;
    width: auto;
    margin: .5rem;
    pointer-events: none;

    display: flex;
    align-items: center;

    /* Centered */
    min-height: calc(100% - 3.5rem);

    /* Scrollable */
    height: calc(100% - 3.5rem);
}

@media screen and (min-width: 576px) {
    .modal-dialog {
        max-width: 500px;
        margin: 1.75rem auto;
    }
}

@media screen and (min-width: 810px) {
    .modal-dialog {
        max-width: 790px;
        margin: 1.75rem auto;
    }
}

@media screen and (min-width: 992px) {
    .modal-dialog {
        max-width: 900px;
        margin: 1.75rem auto;
    }
}

@media screen and (min-width: 1200px) {
    .modal-dialog {
        max-width: 1100px;
        margin: 1.75rem auto;
    }
}

.modal-content {
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100%;
    pointer-events: auto;
    background-color: #ffffff;
    background-clip: padding-box;
    outline: 0;
    max-height: 100%;
    overflow: hidden;
}

.modal-body {
    position: relative;
    flex: 1 1 auto;
    padding: 1rem;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    flex-shrink: 0;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1rem;
}

.modal-header .modal-btn-close {
    background: transparent;
    margin: -.5rem -.5rem -.5rem auto;
    box-sizing: content-box;
    width: 1em;
    height: 1em;
    padding: .25em .25em;
    color: #000;
    border: 0;
    border-radius: .25rem;
    opacity: .5;
}