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


.footer {
          position: fixed;
          left: 0;
          bottom: 0;
          width: 100%;
          background: #4070f4;
          color: white;
          text-align: center;

          font-size: 15px;
          font-weight: 500;

          padding: 8px 0;
          font-family: 'Poppins', sans-serif;

          z-index: 2;
        }

        .header {
          position: fixed;
          /*left: 0;*/
          top: 0;
          width: 100%;
          background: #4070f4;
          color: white;
          text-align: center;

          font-size: 17px;
          font-weight: 500;

          padding: 8px 0;
          font-family: 'Poppins', sans-serif;

          z-index: 2;
        }







.busy {
  cursor: wait;
  opacity: 0.5;
  pointer-events: none;
}

.btn-apex {
  /*  
  left: 50%;
  padding: 1em 2em;
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  */
}


<style>
.submit-btn-apex{
  background-color: black;
  color: #fff;
}
.submit-btn-apex:hover, .submit-btn-apex:focus {
  background-color: #4a0433;
}

.form-control-apex-ade-more{
    border-radius:.5rem;
}




    .btn-apex-x {
        background-color: #ed7b58;
        font-size: 20px;
        color: white;
        padding: 8px;
        transition: background-color 0.3s; /* Smooth transition */
    }
    .btn-apex-x:hover {
        background-color: #d1ba8e; /*#edd8af; */ /* Color on hover */
    }