css scroll in a certain area, not to modify the parent style

When do the project, we will encounter some bits and pieces of technical points. Recorded in case you forget

Requirements: circled the department is rolling. Does not modify the parent style

 

 Code:

<div class = " right-text-bottom " > 
                <div class = " right--the p-text " > There is a beautiful place, where people of all growth. Thick stockade closely linked, that crooked river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that bend bend river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that crooked river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that bend bend river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that crooked river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that bend bend river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that crooked river flowing day and night ...... "Here, 
    26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that bend bend river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi thick stockade closely linked, that crooked river flowing day and night ......" where 26 ethnic groups live in harmony, Aioi
Thick stockade closely linked, that crooked river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that bend bend river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that crooked river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that bend bend river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that crooked river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that bend bend river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that crooked river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that bend bend river flowing day and night ...... "where 
    26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that crooked river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi thick stockade closely linked, that crooked river flowing day and night ......" Here, 26 ethnic groups harmony, Aioi
Thick stockade closely linked, that crooked river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that bend bend river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that crooked river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that bend bend river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that crooked river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that bend bend river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that crooked river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that bend bend river flowing day and night ...... "where 
    26 ethnic groups live in harmony, Aioi have a beautiful place, where people of all growth. Thick stockade closely linked, that crooked river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi thick stockade closely linked, that crooked river flowing day and night ......" Here, 26 ethnic groups harmony, Aioi 
thick stockade closely linked, that crooked river flowing day and night ...... "where 26 ethnic groups live in harmony, Aioi
                 </ div> 
                <-! <div class = " parent " > 
                        <Child " > 
                        lorem ipsum carrots, enhanced undergraduate experience. 
                        ...
                 </ div> -> 
            </ DIV>

.right-text-bottom {
    width: 90%;
    height: 64%;
    overflow: hidden;
    /* border: 1px dashed red; */
}
.right-text-p {
    padding: 0 8% 0 3%;
    text-align: left;
    line-height: 2.4em;
    font-size: 1.3em;
    color: #333333;
    text-indent: 2em;
    white-space: pre-wrap;
    height: 90%;
    width: calc(100% + 1em);
    overflow: auto;
}

There are different opinions or implementation. Welcome to tell me in the comments area.