Image won't align center

Please help, my image can’t align center. Even if in the post mode it’s centered, but once it’s published, it’s aligned left again. I only can center it using code <center></center> manually, but it’s really tiring and time consuming. Any help will appreciated. This is the CSS code:

/*
Theme Name: Turtle Gallery
Theme URI: http://www.wallpaperscars.info/
Description: Turtle Gallery wordpress themes are suitable for wallpaper site, photo gallery, a collection of photos and blogs that contain pictures. With features such as adsense ready, share button, facebook like, google plus, social media and fast-loading makes this very interesting themes.
Version: 1.0
Author: Mas David
Tags : blue,fast-loading,adsense ready, ooND Cakep :D
*/
#wrap{background:#FFF;width:900px;border:1px solid #CCC;margin:10px auto;padding:0 10px 10px}
body{font-family:Verdana, Arial, Helvetica, sans-serif;font-size:.8em;color:#222;background:#f6f6f6;width:930px;margin:0 auto;padding:0}
a{text-decoration:none}
p{text-decoration:none;line-height:20px}
#topheader{background-color:#E9E6E1;border-bottom-color:#06c;border-bottom-style:solid;border-bottom-width:4px;border-left-color-ltr-source:physical;border-left-color-rtl-source:physical;border-left-color-value:#06c;border-left-style-ltr-source:physical;border-left-style-rtl-source:physical;border-left-style-value:none;border-left-width-ltr-source:physical;border-left-width-rtl-source:physical;border-left-width-value:0;border-right-color-ltr-source:physical;border-right-color-rtl-source:physical;border-right-color-value:#06c;border-right-style-ltr-source:physical;border-right-style-rtl-source:physical;border-right-style-value:none;border-right-width-ltr-source:physical;border-right-width-rtl-source:physical;border-right-width-value:0;border-top-color:#06c;border-top-style:none;border-top-width:0;color:#06c;font-size:12px;height:22px;margin-top:10px;padding-top:5px;width:auto}
#date{float:left;padding-left:10px;width:50%}
#subscribe{float:right;padding-right:5px}
#subscribe a{color:#06c;text-decoration:none;padding-right:5px;padding-left:5px}
#header{width:900px;height:75px;background-color:#627AAD}
#title{float:left;text-align:left;text-indent:-5000px}
#title a{color:#06F;text-decoration:none}
#header h1{font-size:16px;font-style:normal;margin:0}
#header .logo{width:145px;height:200px;float:left}
#header .banner{width:728px;float:right;padding-right:25px;padding-left:0;height:90px;margin-top:109px;margin-bottom:0}
#main_topmenu{float:left;width:748px;font-size:14px;display:inline;margin-right:0;margin-bottom:0}
#homelink{padding-left:22px!important}
#dropmenu{float:left;list-style:none;position:relative;line-height:22px;z-index:300;width:740px;padding-top:0;padding-right:0;padding-left:0;background-color:#3f80cf;margin:0 0 10px}
#dropmenu ul{list-style:none;line-height:20px;z-index:300;position:absolute;display:none;top:28px;left:-1px;background-color:#3f80cf;margin:0;padding:0}
#dropmenu a{display:block;color:#FFF;text-decoration:none;padding:3px 8px}
#dropmenu a:hover{color:#000;background-color:#CCC}
#dropmenu li{float:left;position:relative;display:block}
#dropmenu li ul{width:210px}
#dropmenu li ul a{width:195px;height:auto;float:left}
#dropmenu .page_item{background:#FFF}
#dropmenu .page_item .page_item{font-size:11px;border:none}
#dropmenu .page_item li ul a{width:auto}
#dropmenu ul ul{line-height:20px;top:auto}
#dropmenu li ul ul{left:12em;margin:0 0 0 10px}
#dropmenu li:hover ul,#dropmenu li li:hover ul,#dropmenu li li li:hover ul,#dropmenu li li li li:hover ul{display:block}
#search{background:#F7F7F7;border:1px solid #b3b3b3;float:right;height:25px;width:400px;margin:0 15px 0 0}
* html #search{margin-right:8px}
#search input{font-family:Verdana, Arial, Helvetica, sans-serif;background:transparent;border:0;color:#000;float:left;font-size:13px;width:288px;margin:4px 0 0;padding:0 2px 2px 10px}
#bigcontent{width:900px;margin-bottom:5px;background-color:#FFF}
#content{float:left;width:707px;border-right-width:1px;border-right-style:solid;border-right-color:#ccc;margin:0 0 5px;padding:10px 5px 10px 15px}
.entry{margin-bottom:2em}
.entrytitle{border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:#ccc;text-align:center}
.entrytitle h2{font-size:18px;line-height:24px;margin:0 0 5px;padding:0}
.entrytitle h2 a{color:#3f80cf}
.entrytitle h2 a:hover{color:#039}
.entrytitle .meta{color:#111;font-size:12px;margin-bottom:8px;line-height:20px;padding:3px}
.entrytitle .meta a:hover{color:#222}
.entry a,.commentlist a,.navigation a{color:#06c}
.entry blockquote{color:#000;border-color:#666;border-style:solid;border-width:1px 1px 3px 3px;margin:0 30px 20px;padding:0 0 0 10px}
#sidebar{float:right;width:166px;height:100%;min-height:100%}
#sidebar .box{margin-bottom:10px;padding-bottom:6px;padding-left:3px}
#sidebar .box h3,#sidebar h3{font-size:12px;font-weight:700;font-family:arial;color:#fff;background-color:#06c;text-decoration:underline;margin:0;text-transform:uppercase;padding:2px 7px 1px 2px}
#sidebar a{color:#333}
#sidebar ul{list-style-type:none;margin:0 0 5px;padding:0}
#sidebar ul li{background-color:#E9E6E1;margin-bottom:0;border-bottom-width:0;border-bottom-style:solid;border-bottom-color:#ddd;text-decoration:underline;font-family:arial;padding:0 3px 3px 6px}
#sidebar ul li ul{list-style-type:square;margin-left:1.5em;border:0;padding:0}
#footer{background-color:#06c;width:885px;margin:5px 0 0;padding:8px}
#footer p{font-size:11px;color:#CCC;margin:0;padding:0}
#footer p a{color:#FFF}
#footer p a:hover{color:#fff}
#foot-left{float:left;font-size:12px;color:#FFF;text-align:left;height:70%}
#foot-left a{color:#FFF;padding-right:5px}
#footer .right{float:right;width:20%;text-align:right}
.commentsblock textarea{width:530px}
.commentsblock input,.commentsblock textarea{border:1px solid #d1d1d1;width:500px}
ol.commentlist{color:#222;list-style-type:none;margin:1.5em 0 0;padding:0}
.commentlist li{margin-bottom:4px;border:1px solid #CCC;padding:3px}
h3#comments{font-size:1.6em}
.commentcount{float:right;font-weight:700;font-size:16px}
.commentcount a{color:#ccc}
.commentcount a:hover{color:#999}
p img{max-width:100%;padding:0}
img.centered{display:block;margin-left:auto;margin-right:auto}
img.alignright{display:inline;margin:0 0 2px 7px;padding:4px}
img.alignleft{display:inline;margin:0 7px 2px 0;padding:4px}
.alignleft{float:left}
.menu{border:0 solid #403f3f;background:transparent;overflow:hidden;width:773px;position:absolute;margin:-3px 0 0 140px;padding:0}
* html .menu{height:1%}
.menu ul{float:left;margin:0;padding:3px}
.menu li{display:inline;font-weight:700;float:left;background-color:transparent;padding:2px}
.menu li a{color:#fff;display:block;margin-right:2px;float:left;margin-top:3px;margin-left:3px;padding:7px 10px 8px}
.menu li a:hover{background:#06c;color:#fff;text-decoration:none}
#adsense-menu{width:880px;background:#06c;border-top:5px solid #06c;color:#fff;height:20px;margin:125px 0 8px;padding:4px 10px 5px}
.item1{width:164px;height:274px;float:left;border:1px solid #CCC;margin:3px}
.item1 h2 a{color:#1676ad;text-decoration:none}
.item1 h2 a:hover{color:#1676ad;text-decoration:underline}
.item2{width:164px;height:274px;float:left;border:1px solid #666;margin:3px}
.item2 h2 a{color:#de1c1c;text-decoration:none}
.item2 h2 a:hover{color:#de1c1c;text-decoration:underline}
.hometitle h2{text-align:center;font-size:12px;padding-top:5px}
.hometitle a:hover{color:#06c;text-decoration:underline;font-size:14px}
.hometitle a{color:#06c;text-decoration:underline;font-size:14px;font-weight:700}
.hometitle{margin-top:3px;text-align:center;width:165px;margin-bottom:3px}
.rate{text-align:center;font-size:11px;color:#06c;font-weight:700;margin:15px 0 0}
.views{text-align:center;font-size:15px;padding-left:0;color:#06c;text-decoration:underline;font-weight:700;margin-bottom:12px}
.pubdate{text-align:center;font-size:11px;padding-left:0;color:#06c;text-decoration:none}
.wp-pagenavi{padding-top:25px}
#phones{background-color:#fff;border-left:solid 4px #fff;border-right:solid 4px #fff;border-top:solid 4px #fff;border-bottom:solid 4px #fff}
#phones p{font-size:12px;background:#B9C9FE;border-bottom:solid 1px #fff;padding:4px 6px}
#phones table{background:#B9C9FE;border-top:solid 1px #F1F0E5;border-bottom:solid 1px #fff}
#phones th,#phones td{font:12px Arial;vertical-align:top;padding:1px 6px}
#phones th{width:70px;font-weight:700;text-transform:uppercase;color:#00198F;border-right:solid 1px #00198F}
#phones td{background:#fff;color:#000;border-bottom:solid 1px #EFF3FF}
#phones td.ttl{font-weight:700;background-color:#E8EDFF}
#adsfront{float:left;padding:1px 4px}
#adsarchive{float:right;padding:1px 23px 1px 4px}
#adscomment{float:right;padding:1px 6px 1px 1px}
.commentsblock{width:500px}
#adssing{margin-left:-20px}
.meta{text-align:center}
h1{margin:0}
.bookmark{border:1px solid #f0f0f0;background:#f5f5f5;height:95px;width:533px;margin:0;padding:10px}
.bookmark h4{color:#666;font:bold 19px/19px Arial, sans-serif;border-bottom:solid 1px #eee;margin:0;padding:0}
.book{float:left;border:1px solid #eee;background:#fff;margin:0 5px 0 0;padding:1px}
.bookas{float:left;border:1px solid #eee;background:#fff;margin:0 11px 0 0;padding:1px;padding-top:6px;padding-left:6px;width:73px;height:30px}
.booklast{float:left;border:1px solid #eee;background:#fff;margin:0;padding:1px}
#ratview{float:right;background-color:#E9E6E1;width:80px;height:62px;padding:30px 40px 25px 30px}
.navigation{clear:both}
img,#sidebar ul li ul li{border:0}
#subscribe a:hover,#foot-left a:hover{text-decoration:underline}
#dropmenu li:hover ul ul,#dropmenu li:hover ul ul ul,#dropmenu li:hover ul ul ul ul,.menu li ul,#phones caption{display:none}
.entrytitle .meta a,#sidebar a:hover{color:#06C}
.entry a:hover,.commentlist a:hover,.navigation a:hover,#phones td.nfo{color:#000}
.commentsblock textarea:focus,.commentsblock textarea:focus,.commentsblock input:focus{background:#eee;border:1px solid #a1a1a1}
.alignright,#logos{float:right}
.item1 h2,.item2 h2{font-size:.8em;text-align:left;padding-left:5px;margin:0 0 3px}
.item1 p,.item2 p{margin:2px 0 3px}
.item1 img,.item2 img{margin-left:0;padding:2px}