.ex1 {
border: 1px solid black;
outline-style: solid;
outline-color: red;
outline-width: thin;
}
.ex2 {
border: 1px solid black;
outline-style: solid;
outline-color: blue;
outline-width: medium;
}
.ex3 {
border: 1px solid black;
outline-style: solid;
outline-color: orange;
outline-width: thick;
}
.ex4 {
border: 1px solid black;
outline-style: solid;
outline-color: green;
outline-width: 4px;
}