.error {
    color:red;
}
.mb-40 {
    margin-bottom:40px;
}
.mb-10 {
    margin-bottom:10px;
}
.mt-40 {
    margin-top:40px;
}
.mt-10 {
    margin-top:10px;
}
.mt-20 {
    margin-top:10px;
}
.ml-10 {
    margin-left:10px;
}
.mr-10 {
    margin-right:10px;
}
.ml-20 {
    margin-left:20px;
}
.text-c{
     text-align:center;
}
.text-l{
     text-align:left;
}
.text-r{
     text-align:right;
}