styles.css

html, body, .container-fluid {
  background-color: #D6D8DC;
}

#button-selection-container {
  margin: 20px auto;
  width: 360px;
  height: 180px;
}

#keyboard {
  margin: 0;
  padding: 0;
  list-style: none;
}

#keyboard li {
  float: right;
  margin: 5px;
  width: 80px;
  height: 80px;
  line-height: 80px;
  text-align: center;
  background: #fff;
  border: 1px solid #f9f9f9;
  -moz-border-radius: 5px;
  -webkit-border-radius: 5px;
}

#keyboard li:hover {
  position: relative;
  top: 1px;
  left: 1px;
  border-color: #e5e5e5;
  cursor: pointer;
}

.selected {
  position: relative;
  top: 1px;
  left: 1px;
  border-color: #e5e5e5;
  background: #cecece !important;
  cursor: pointer;
}

#settings-area {
  margin: 71px auto;
  width: 80%;
  height: 150px;
  border: 1px solid #6c757d;
  -moz-border-radius: .4rem;
  -webkit-border-radius: .4rem;
}

#settings-area-mode {
  height: 110px;
  text-align: center;
}

.button-mode-settings{
  display: inline-flex;
  margin: 30px;
}

.text-input {
  font-size: 16px;
  height: 110px !important;
}

.right-aligned-buttons{
    margin: 10px;
    text-align: end;
}

.left-aligned-buttons{
  margin-left: 10px;
  float: left;
}

#ports-error{
  color: red;
  margin: auto 10px;
  vertical-align: middle
}

#ports-hint{
  font-size: 22px;
  text-align: start;
  margin: auto 10px;
  vertical-align: middle;
}

.command-input{
  width: 90px;
  text-align: center;
}

#action-buttons{
  display: inline-flex;
  float: right;
}

.modal-header {
  border-bottom: 0 none;
}

.modal-footer {
  border-top: 0 none;
}