<script id="TasksTemplate" type="text/x-jquery-tmpl">    
    {{each Tasks}}
        {{if TimeWhenTaskCompleted==null}}       
        <span>
            <input type="checkbox" class="checkbox" name="${Id}" value="${Id}"></span>
    <span style="color: #e67400;">${Name}</span>
    {{else}}    
        <span>
            <input type="checkbox" class="checkbox" name="${Id}" value="${Id}" checked></span>
    <span class="completedTask text">${Name}</span>
    {{/if}}
        <a class="text" href="/Task/${Id}">изменить</a>
    <a class="DeleteLink href="/Task/DeleteTask/${Id}">удалить</a>
    

    {{/each}}
</script>

<div class="tasks"></div>

.tasks {
     position: absolute;
    overflow: auto;  
    line-height: 0.85;
    width: calc(100% - 180px);
    height: calc(100% - 30px - 10px);
    white-space: pre-line;
    word-break: break-all;
}

<span class="completedTask text">${Name}</span>