.modal {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 2000;
    display: none;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.modal-dialog {
    position: relative;
    width: auto;
    pointer-events: none;
    max-width: 60%;
    margin: 1.75rem auto;
}

.modal-open .modal {
    overflow-x: hidden;
    overflow-y: auto;
}

.modal-content {
    position: relative;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-direction: column;
    flex-direction: column;
    width: 100%;
    pointer-events: auto;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid rgba(0, 0, 0, 0.2);
    border-radius: 0.3rem;
    outline: 0;
}

.modal-header {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: start;
    align-items: flex-start;
    -ms-flex-pack: justify;
    justify-content: space-between;
    padding: .5rem;
    border-bottom: 1px solid #dee2e6;
    border-top-left-radius: 0.3rem;
    border-top-right-radius: 0.3rem;
    height: 1.4rem;
}

.modal-body {
    -ms-flex: 1 1 auto;
    flex: 1 1 auto;
    padding: 1rem;
}

.modal-header .close {
    padding: 1rem 1rem;
    margin: -1rem -1rem -1rem auto;
}

button.close {
    padding: 0;
    background-color: transparent;
    border: 0;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

.close {
    float: right;
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1;
    color: #000;
    text-shadow: 0 1px 0 #fff;
    opacity: .5;
}

.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1040;
    width: 100vw;
    height: 100vh;
    background-color: #000;
}

.modal-backdrop.show {
    display:block;
    opacity: 0.5;
}

@media screen and (max-width: 600px) {
    .modal-dialog {
        max-width: 500px;
        margin: 1.75rem auto;
    }
}