正在删除水平滚动条

在下面的jsfiddle中，有两个按钮可以打开屏幕左侧或右侧的菜单div。

当菜单打开时，站点的其余部分(我使用的是htmldiv(也随之移动。

我的问题是，当打开左侧菜单时，htmldiv会左右滚动，而当打开右侧菜单时则不会。

我不知道为什么会这样，但如果可能的话，我想删除从左到右的滚动，而不添加overflow:hidden，因为那样我也会失去上下滚动的能力。

https://jsfiddle.net/8nj5y4t1/62/

我的代码如下：

HTML:

<header class="header">
  <span id="button-one"></span>
  <span id="button-two"></span>
  <div class="push-menu-one"></div>
  <div class="push-menu-two"></div>
  <div class="overlay"></div>
</header>
<div class="content"></div>
<footer class="footer"></footer>

CSS:

html {
  position:relative;
  height:100%;
  left:0;
  right:0;
  background-color:pink;
  -webkit-transition: all .6s cubic-bezier(.645,.045,.355,1);
  transition: all .6s cubic-bezier(.645,.045,.355,1); 
}
body {
  min-height:100%;
  margin:0; 
  padding:0; 
  display:-webkit-box;
  display:-webkit-flex;
  display:-ms-flexbox;
    display:flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  -ms-flex-direction: column;
    flex-direction: column;
}
.header {
  height:70px;
  width:100%;
  background-color:white;
}
.content {
  -webkit-box-flex: 1;
  -webkit-flex: 1;
  -ms-flex: 1;
    flex: 1;
  width:85%;
  margin-top:50px;
  margin-left:auto;
  margin-right:auto;
}
.footer {
  display:-webkit-box;
  display:-webkit-flex;
  display:-ms-flexbox;
    display:flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  -ms-flex-direction: column;
    flex-direction: column;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
    align-items: center;
  height: auto;
  width: 100%;      
  padding: 10px 0 10px 0;
  background-color: #efefef;
 }
/* PUSH MENUS */
#button-one {
  display:inline-block;
  width:30px;
  height:30px;
  margin:20px;
  background-color:green;
  cursor:pointer;
}
#button-two {
  display:inline-block;
  float:right;
  width:30px;
  height:30px;
  margin:20px;
  background-color:orange;
  cursor:pointer;
}
.push-menu-one {
  position:fixed;
  top:0px;
  left:-295px;
  width:295px;
  height:100%;
  margin:0;
  padding:0;
  background-color:wheat;
  -webkit-transition: all .6s cubic-bezier(.645,.045,.355,1);
  transition: all .6s cubic-bezier(.645,.045,.355,1);
}
.push-menu-two {
   position:fixed;
   top:0px;
   right:-295px;
   width:295px;
   height:100%;
   margin:0;
   padding:0;
   background-color:darkred;
   -webkit-transition: all .6s cubic-bezier(.645,.045,.355,1);
   transition: all .6s cubic-bezier(.645,.045,.355,1);
}
.overlay {
   position:fixed;
   z-index:9;
   top:0px;
   left:0px;
   width:0px;
   height:0px;
   background-color:#000000;
   opacity:0;
   transition: opacity 1s, width 0s ease 1s, height 0s ease 1s;
 }
.overlay.open-right,
.overlay.open-left {
   width:100%;
   height:100%;
   opacity:0.4;
   transition: opacity 1s;
}
/* TOGGLE CLASSES */
html.open-left {
  left:295px;
}
.push-menu-one.open-left {
  left:0;
}
html.open-right {
  left:-295px;
}
.push-menu-two.open-right {
  right:0;
}

jQuery:

jQuery(document).ready(function($) {    
    $('#button-one').click(function() {
        $('html, .overlay, .push-menu-one').toggleClass('open-left');
 });
 $('#button-two').click(function() {
        $('html, .overlay, .push-menu-two').toggleClass('open-right');
});
$('.overlay').click(function() {
        $('html, .overlay, .push-menu-one, .push-menu-two').removeClass('open-left');
$('html, .overlay, .push-menu-one, .push-menu-two').removeClass('open-right');
});
});