html,
body {
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
}

.form-signin {
  width: 100%;
  max-width: 500px;
  padding: 25px;
  margin: auto;
  border-radius: 15px;
  background: rgba(0, 0, 0, 0.15);
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

@media only screen

  and (min-device-width: 360px)

  and (max-device-width: 740px)

  and (-webkit-min-device-pixel-ratio: 4) {

  .form-signin {
  width: 100%;
  max-width: 330px;
  padding: 25px;
  margin: auto;
  border-radius: 15px;
  background: rgba(0, 0, 0, 0.15);
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

}
/*
.form-signin .checkbox {
  font-weight: 400;
}
.form-signin .form-control {
  position: relative;
  box-sizing: border-box;
  height: auto;
  padding: 10px;
  font-size: 16px;
}
.form-signin .form-control:focus {
  z-index: 2;
}
.form-signin input[type="email"] {
  margin-bottom: -1px;
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
}
.form-signin input[type="password"] {
  margin-bottom: 10px;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}
*/