.testruta1 {
    height: 200px;
    width: 500px;
    background-color: green;
    margin-top: 100px;
    margin-left: auto;
    margin-right: auto;
    border-radius: 50px;
}
.testruta2 {
    height: 200px;
    width: 500px;
    background-color: blue;
    margin-top: 100px;
    margin-left: auto;
    margin-right: auto;
    border-radius: 30px 15px;
}
.testruta3 {
    height: 200px;
    width: 500px;
    background-color: purple;
    margin-top: 100px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 100px;
    border-radius: 50px 100px 5px;
}