Dodaj placeholder do input-ów nawet pusty
<input type="text" class="new-task" placeholder=""/>
a w css-ie
input:checked + label .new-task:not(:placeholder-shown)
{
text-decoration-color: #06D001;
border: 2px solid #06D001;
}
kod na obrazku
<input type="text" class="new-task" placeholder=""/>
<input type="text" class="new-task"/>
