.input-prepend.input-append input {
  font-size: 24px;
  padding-top: 11px;
  padding-bottom: 11px;
  width: 100px;
  text-align: right;
}

.explain-area-box {
    border: 1px solid #FF0000;
    padding : 7px;
    background: #FFEEEE;
    margin-bottom: 15px;
    color: #FF0000;
}