.modal-content {
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100%;
    pointer-events: auto;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid rgba(0,0,0,.2);
    border-radius: 0.3rem;
    outline: 0;
    color: #333;
}
.modal-header {
    display: flex;
    flex-shrink: 0;
    align-items: center;
    justify-content: space-between;
    padding: .5rem 1rem;
    border-bottom: 1px solid #dee2e6;
    border-top-left-radius: calc(0.3rem - 1px);
    border-top-right-radius: calc(0.3rem - 1px);
}
.modal-header > button.close {
    cursor: pointer;
    background-color: transparent!important;
    float: right!important;
    -webkit-appearance: button;
    text-transform: none;
    height: 3em;
}
.modal-header > h4 {
   font-size: 1.75rem;
}
.modal-title {
    margin: 0;
    line-height: 1.5;
}
.modal-body {
    position: relative;
    flex: 1 1 auto;
    padding: 1rem;
}
.modal-footer {
    display: flex;
    flex-wrap: wrap;
    flex-shrink: 0;
    align-items: center;
    justify-content: flex-end;
    padding: 0.75rem;
    border-top: 1px solid #dee2e6;
    border-bottom-right-radius: calc(0.3rem - 1px);
    border-bottom-left-radius: calc(0.3rem - 1px);
}
.modal-footer .center{
    margin-right: auto!important;
    margin-left: auto!important;
}

/* button */
.modal-footer .btn {
    display: inline-block;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
    background-color: transparent;
    border: 1px solid transparent;
    padding: 0.25rem 0.5rem;
    font-size: .875rem;
    border-radius: 0.2rem;
    transition: color .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out;
}
.modal-footer .btn.modal-close:disabled{
    color: #6c757d;
    background-color: transparent;
    pointer-events: none;
    opacity: .65;
    border-color: #6c757d;
}
.modal-footer .btn.modal-close{
    cursor: pointer;
    color: #fff;
    background-color: #0d6efd;
    border-color: #0d6efd;
}
modal-footer .btn.modal-close:hover {
    color: #fff;
    background-color: #0b5ed7;
    border-color: #0a58ca;
}