Use single selector when targeting one class. 

 A variety of solution options are available.

 grouping selector when targeting multiple classes with the same styles.

.teacher-list ,.custom-state-field {
background-color: #e0f7fa;
font-weight: bold;
color: #1a73e8 !important;
padding: 5px;
border-radius: 4px;
}  // this you won't change  xml file 

descendant selector when targeting a class inside another class.   

<group class="teacher-list">  // here you won't change css

The path needed is relative to the folder where the manifest is located.

You have no "Hospital" folder in the same folder as the manifest. You have just the "static" folder.