White Space over header area

I searched for similiar problems already, but could not resolve the issues with the suggested Solutions.
This is my existing custom CSS modification.
Page url: http://www.workheld.com/?page_id=8&lang=de
Thanks for help.

/* Elements
-------------------------------------------------------------- */
	a {
		color: #123d64;
	}
	h1 a, h2 a, h3 a, h4 a, h5 a, h6 a {
		color: #123d64;
	}
	.text-color { color: #62a343 ;}
	button,
	input[type="button"],
	input[type="reset"],
	input[type="submit"] {
		background-color: #62a343 ;
		border: 1px solid #62a343 ;
	}
	button:hover,
	input[type="button"]:hover,
	input[type="reset"]:hover,
	input[type="submit"]:hover {
		background-color: transparent;
		color: #62a343 ;
	}
	textarea:focus,
	input[type="text"]:focus,
	input[type="password"]:focus,
	input[type="datetime"]:focus,
	input[type="datetime-local"]:focus,
	input[type="date"]:focus,
	input[type="month"]:focus,
	input[type="time"]:focus,
	input[type="week"]:focus,
	input[type="number"]:focus,
	input[type="email"]:focus,
	input[type="url"]:focus,
	input[type="search"]:focus,
	input[type="tel"]:focus,
	input[type="color"]:focus {
		border: 1px solid #123d64;
	}
    #mainnav ul li a:hover {
	color: #62a343;
   }
	#mainnav > ul > li > a.active,
	#mainnav > ul > li > a:hover {
		color: #123d64;
	}
	#mainnav ul li ul:after {
		background-color: #123d64;
		transition: all 0.3s ease;
		-webkit-transition: all 0.3s ease;
	}
	#mainnav .sub-menu li:hover > a {
		background-color: #62a343;
	}
	.error-wrap #search-submit:hover {
		background-color: #123d64;
		border-color: #123d64;
	}
	.text-slider .maintitle:after {
		background-color: #123d64;
	}
	.content-area .hentry:after {
		background-color: #123d64;
	}
	.hentry .meta-post a:hover {
		color: #123d64;
	}
	.hentry blockquote {
	    border-left: 3px solid #123d64;
	}
	.blog-pagination ul li {
		border: 1px solid #123d64;
	}
	.blog-pagination ul li.active,
	.blog-pagination ul li:hover a {
		background-color: #123d64;
	}
	.sidebar .widget:before {
		background-color: #123d64;
	}
	.widget-tags .tag-list a:hover {
		border: 1px solid #123d64;
	}
	.comment .comment-detail {
		border: 1px solid #123d64;
	}
	.bottom .socials li:hover a,
	.go-top {
		background-color: #123d64;
	}
	.go-top:hover {
		color: #123d64;
	}
	.switcher-container .switcher-icon a:focus {
		color: #123d64;
	}

	.owl-theme .owl-controls .owl-page span{
	  border: 2px solid #62a343;
	}
	.owl-theme .owl-controls .owl-page.active span,
	.owl-theme .owl-controls.clickable .owl-page:hover span{
	  background-color: #62a343;
	}
	.roll-icon-box .icon {
		border: 1px solid #123d64;
	}
	.roll-icon-box .icon i,
	.roll-icon-box .content h3 a:hover {
		color: #123d64;
	}
	.roll-icon-box.white .icon {
		background-color: #123d64;
	}
	.roll-icon-box.white .content h3 a {
		color: #123d64;
	}
	.roll-icon-list .icon {
		border: 1px solid #123d64;
	}
	.roll-icon-list .icon i,
	.roll-icon-list .content h3 a:hover {
		color: #123d64;
	}
	.roll-button {
		background-color: #62a343 ;
		border: 1px solid #62a343 ;
	}
	.roll-button:hover {
		color: #62a343 ;
	}
	.roll-button.border {
		color: #62a343 ;
		border: 1px solid #62a343 ;
	}
	.roll-button.border:hover {
		background-color: #62a343 ;
	}
	.roll-button.light:hover {
		border: 1px solid #62a343 ;
		background-color: #62a343 ;
}

.go-top.show {
    right: auto !important;
    left: 20px !important;

}
.page-id-815 .content-area {
    margin-top: -30px;
}

.page-id-815 .page-wrap .content-wrapper {
    padding: 0;
}

.page-id-815 .page-wrap {
    padding-top: 0;
}
.page-id-815 .fp-content-area {
  margin-top: -25px;
}
.master-slider-parent {
  margin-top: -25px;
}
.page-id-815 .header-image {
   background-image:none;
   display: none;
}
.page-id-815 .header {
    background-color: transparent !important;
}

.page-id-815 .header-image {
    margin-top: -80px !important;
    z-index: -99 !important;
}

.page-id-815 #header.upscrolled {
    background-color: white !important;
}
.page-id-844 .page-wrap {
    padding-top: 0;
}
.page-id-844 .fp-content-area {
  margin-top: -25px;
}
.page-id-844 .header-image {
   background-image:none;
   display: none;
}
.page-id-844 .header {
    background-color: transparent !important;
}

.page-id-844 .header-image {
    margin-top: -80px !important;
    z-index: -99 !important;
}

.page-id-844 #header.upscrolled {
    background-color: white !important;
}
#floatingbox { position: fixed; RIGHT: 1px; top: 350px; width:0px; height:80px; z-index:9999; -moz-transform: rotate(-90deg); -webkit-transform: rotate(-90deg); -o-transform: rotate(-90deg); -ms-transform: rotate(-90deg); transform: rotate(-90deg); padding: padding: 25px 15px 10px 20px;
 }

 

#floatingbox a
 {
 font-family: Arial; color: #ffffff; font-size: 20px; background: #62a343; padding: 10px 20px 10px 20px; text-decoration: none; } #floatingbox a:hover { background: #0c2c4e; text-decoration: none;
 }
.page-id-732 #floatingbox {display:none;}
.page-id-754 #floatingbox {display:none;}
.page-id-746 #floatingbox {display:none;}

Hello @cko,

Please try to temporarily deactivate all your plugins except Sydney Toolbox and Page Builder by SiteOrigin, and see if it helps.

Kind Regards, Roman.