score:0

button{
float:right;
position:inherit;
}

score:0

form.form:after {
   content: '';
   display: block;
   height: 0;
   clear: both;
   visibility: hidden;
}

score:0

 <div class="ui right aligned container">
     <button class="ui button" type="submit">Add All</button>
 </div>

score:4

.ui.clearing.segment::after {
    content: ".";
    display: block;
    height: 0;
    clear: both;
    visibility: hidden;
}

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