body {
  padding-top: 40px;
  padding-bottom: 40px;
  background-color: #ffffff;
}

.form-signin {
  max-width: 760px;
  padding: 15px;
  margin: 0 auto;
}
.form-signin .form-signin-heading {
  margin-bottom: 10px;
}

#sender_submit {
    background-color: #000000 !important;
    color: #ffffff !important;
    border-color: #000000 !important;
    transition: all 0.3s ease;
}

#sender_submit:hover {
    background-color: #fdde09 !important;
    color: #000000 !important;
    border-color: #fdde09 !important;
}