回答編集履歴
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コメントを受けて追記
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@@ -23,3 +23,253 @@
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```
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# コメントを受けて追記
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以下のように変更してみてはいかがでしょうか。
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[サンプル](https://jsfiddle.net/Lhankor_Mhy/an67y13e/)
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```scss
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//ドロワーサイドメニュー
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.side-menu {
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position: fixed;
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top: 0;
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right: -300px;
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width: 300px;
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height: 100%;
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padding-top: 150px;
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text-align: left;
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font-size: 13px;
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background-color: rgba($font-color,0.95);
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z-index: 2;
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z-index: -1; // 追加
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// ...
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//ドロワー内コンテンツ
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.wrapper {
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position: relative;
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width: 100%;
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height: 100%;
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-webkit-transition: all .5s ease;
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transition: all .5s ease;
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// z-index: 2; 削除
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}
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.contents {
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width: 100%;
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background: #fff;
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}
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// ...
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// index.html トップページ
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.top-wrapper {
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background:linear-gradient(90deg,#fff 0%,#fff 24.5%,$bg-color 24.5%,$bg-color 100%);
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color: #FFFFFF;
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height: 668px;
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position: relative;
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// z-index: 0; 削除
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margin-bottom: 78px;
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@include mq('md') {
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height: 1024px;
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background:linear-gradient(90deg,#fff 0%,#fff 27%,$bg-color 27%,$bg-color 100%);
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}
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@include mq('lg') {
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height: 740px;
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background:linear-gradient(90deg,#fff 0%,#fff 46%,$bg-color 46%,$bg-color 100%);
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}
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// 追加
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.top-text-logo,
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.top-sub-head-top,
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.top-sub-head-bottom
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{
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position: relative;
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z-index: 1;
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}
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// 追加ここまで
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&:before {
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content: "";
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position: absolute;
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background-image: url(http://placehold.jp/24/cc9999/993333/150x100.png?text=the-honest-company-uM-WXMr-3@2x.png);
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width: 76.5%;
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height: 87%;
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object-fit: cover;
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background-position: 54.5% 0%;
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background-size: 450%;
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background-repeat: no-repeat;
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// z-index: -2; 削除
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@include mq('md') {
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height: 87%;
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width: 78%;
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background-position: 55% 0;
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background-size: 330%;
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}
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@include mq('lg') {
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background-size: 123%;
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background-position: 80% 5%;
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width: 76.5%;
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height: 86.5%;
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}
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}
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&:after{
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content: "";
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position: absolute;
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background-color: rgba($color: #000000, $alpha: 0.35);
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width: 76.5%;
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height: 87%;
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background-position: 55% 0%;
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top: 0;
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// z-index: -2; 削除
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@include mq('md') {
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width: 78%;
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height: 87%;
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background-position: 45% 44%;
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}
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@include mq('lg') {
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width: 76.5%;
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height: 86.5%;
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background-position: 30% 45%;
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}
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}
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```
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---
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z-indexは意外とややこしい仕様なので、あまり多用すると自分の首を絞めかねないです。
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参考：
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[君は真に理解しているか？z-indexとスタッキングコンテキストの関係 - ICS MEDIA](https://ics.media/entry/200609/)
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