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我是新的HTML CSS，我很困惑與通知欄這應該是響應採用全屏幕時，它是在mobile.But我試過它不擴大。 
如何用絕對位置覆蓋父寬度？
但對我來說，這是行不通的
HTML標記
<!doctype html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title></title>
<meta name="description" content="">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="css/InterestPage.css">
</head>
<body>
<!--[if lt IE 8]>
<p class="browserupgrade">You are using an <strong>outdated</strong> browser. Please <a href="http://browsehappy.com/">upgrade your browser</a> to improve your experience.</p>
<![endif]-->
<header>
<div class="innerwrapper">
<h1><a href="#">Feel Hunt</a></h1>
<div class="otherOptions">
<div class="notificationdiv">
<div class="notifyCoun">
<p>3</p>
</div>
<svg style="enable-background:new 0 0 48 48;" version="1.1" viewBox="0 0 48 48" xml:space="preserve" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><style type="text/css">
.st0{display:none;}
.st1{fill:none;stroke:#303030;stroke-width:0.7;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;}
.st2{fill:#303030;}
</style><g class="st0" id="Padding__x26__Artboard"/><g id="Icons"><g><path class="st1" d="M12.44998,29.25c0.4714-1.86041,0.98683-3.71044,1.39399-5.58655 c0.20076-0.92508,0.37522-1.85624,0.50479-2.79409c0.12749-0.92277,0.12761-1.86938,0.32255-2.78069 c0.17715-0.82819,0.41986-1.62416,0.79385-2.38678c0.72808-1.48468,1.84795-2.76857,3.21698-3.69551 c1.54611-1.04685,3.39019-1.61638,5.25786-1.61638c2.6,0,4.96,1.06,6.66999,2.76999 c1.1685,1.1685,1.95078,2.64423,2.40368,4.22483c0.48483,1.69205,0.49984,3.44094,0.81387,5.16177 c0.41544,2.27656,1.13475,4.46739,1.71247,6.7034"/><path class="st1" d="M36.75998,35.78003H11.24002c-0.35004,0-0.60004-0.33002-0.5-0.67004L12.44998,29.25h23.09003 l1.71997,5.85999C37.36002,35.45001,37.11002,35.78003,36.75998,35.78003z"/><path class="st1" d="M22.39999,35.86509V36.32c0,0.71,0.58,1.29,1.29,1.29h0.93c0.71,0,1.29-0.58,1.29-1.29v-0.43993"/><path class="st1" d="M21.00458,13.27578c-1.74433,0.9948-3.03389,2.64047-3.76966,4.84763"/><line class="st1" x1="16.98094" x2="16.84722" y1="20.13664" y2="21.16766"/></g></g></svg>
//this is notifcation panel DIV
<div class="notificationPanel">
this should be full screen
</div>
</div>
<div class="profilePicDrop">
<img src="./img/sky-night-space-trees%20(4).jpeg" alt="">
<div class="getDisplayNone dropDown">
<a href="#">vdvdv</a>
</div>
</div>
</div>
</div>
</header>
</body>
</html>
Homepage.scss
@import "utils/_reset";
@import url('https://fonts.googleapis.com/css?family=Roboto+Condensed:300,400');
@import "utils/_variables";
body{
background: #EEEEEE;
}
header{
width: 100%;
position: fixed;
height:50px;
top:0;
left:0;
right: 0;
background: #ffffff;
box-shadow: 0px 11px 32px -1px rgba(0,0,0,.04);
.innerwrapper{
display: flex;
align-items: center;
justify-content: center;
height: 50px;
width: 75%;
margin: 0 auto;
}
h1{
color: #393e46;
font-family: $FontStyle;
text-transform: uppercase;
letter-spacing: 1.5px;
font-weight: 400;
a{
padding: 5px;
border: 1px solid #393e46;
text-decoration: none;
color: #393e46;
font-size: 13px;
transition: all 100ms ease-in-out;
&:hover{
background:#393e46 ;
color: #ffffff;
}
}
}
.otherOptions{
margin-left: auto;
display: flex;
align-items: center;
.profilePicDrop{
width: 25px;
height:25px;
position: relative;
margin-left: 12px;
img{
width: 25px;
height:25px;
border-radius: 50px;
}
.dropDown{
width: 150px;
height:150px;
background: #ffffff;
position: absolute;
right: 5px;
top:35px;
border-radius: 5px;
box-shadow: 0px 0px 17px 0px rgba(0,0,0,0.1);
}
}
}
}
.getDisplayNone{
display: none;
}
.getDropMenuIn{
animation: PopIn;
animation-duration: 0.3s;
animation-fill-mode: forwards;
}
.getOutDropMenu{
animation: PopOut;
animation-duration: .3s;
animation-fill-mode: forwards;
}
.notificationdiv{
margin-top: 5px;
position: relative;
svg{
width: 30px;
height:30px;
}
.notifyCoun{
position: absolute;
display: flex;
align-items: center;
justify-content: center;
background: #E74C3C;
width: 17.5px;
height:17.5px;
border-radius: 50px;
box-shadow: 0px 4px 14px 0px rgba(231,77,60,0.3);
p{
font-size: 12px;
font-family: $FontStyle;
color: #ffffff;
font-weight: 300;
}
}
&:hover{
cursor: pointer;
}
}
//this is notification panel css
.notificationPanel{
position: absolute;
top: 50px;
left: 0;
right: 0;
background: #ffffff;
width: 100%;
}
@keyframes PopIn {
from{
transform: scale(0.8);
opacity: 0.5;
transform-origin: 150px -5px;
}to{
transform: scale(1);
opacity: 1;
visibility: visible;
}
}
@keyframes PopOut {
from{
opacity: 1;
}to{
opacity: 0.1;
visibility: hidden;
transform: scale(0.5);
transform-origin: 150px -5px;
}
}