My CSS has gone awry

Can someone help I have been trying to debug this for hours and I can't spot error (if it's a bug). I was diligently following along and copying all given code and everything was going fine until now when I checked my my Lake Tahoe website and discovered that several things have gone wrong, the span text is not centered and so too the paragraph below it. Also the inverted arrow below the main header has become huge. In 'Check Out Wildlife the image of the bear has disappeared. Then the two other images below the bear are no longer inline but are now block although my CSS says inline.

Maybe I made an error somewhere but I tried to compare with the CSS of the same from Treehouse and everything seems okay, until I refresh my Lake Tahoe page to see that the errors are still there. I also copy pasted the CSS from the tutorials into my CSS and everything went back to normal, but I would swear the codes are the same. Here is my code below:

/* Base Styles -------------------- */

• { box-sizing: border-box; }

body { color: #878787; margin: 0; font: 1em/1.5 "Helvetica Neue", Helvetica, Arial, sans-serif; }

h1 {
font-size: 5.625rem; /* 90px/16px */ color: rgba(255, 255, 255, 1); text-transform: uppercase; font-weight: normal; line-height: 1.3; text-shadow: 0 1px 1px rgba(0,0,0,.8); }

h2 { font-size: 3.3125em; /* 53px/16px / font-weight: normal; line-height: 1.1; margin: 0 0 .5em; / 0 0 26px */ }

h3 { font-size: 1.25em; /* 20px/16px / color: #48525c; line-height: 1.2; margin-bottom: 1.7em; / 34px */ }

img { max-width: 100%; margin-bottom: 20px; border-radius: 10px; }

ul, ol { margin: 30px 0; }

li { margin-bottom: 10px; }

/* Pseudo-classes ------------------ */

a:link { color: rgb(255, 169, 73); text-decoration: none; }

a:visited { color: lightblue; }

a:hover { color: rgba(255, 169, 73, .4); }

a:active { color: lightcoral; }

/* Main Styles --------------------- */

.main-header { padding-top: 170px; height: 850px;

background: linear-gradient(#ffa949, transparent 90%), #ffa949 url('../img/mountains.jpg') no-repeat center; background-size: cover;

.title { color: white; font-size: 1.625rem; /* 26px/16px */

}

.intro { font-size: 1.25em; /* 20px/16px */ line-height: 1.6;
}

.primary-content, .main-header, .main-footer { text-align: center; }

.primary-content { padding-top: 25px; padding-bottom: 95px; }

.secondary-content { padding-top: 80px; padding-bottom: 70px; border-bottom: 2px solid #dfe2e6; }

.callout { font-size: 1.25em; border-bottom: 3px solid; padding: 0 9px 3px; margin-top: 20px; display: inline-block; }

.main-footer { padding-top: 60px; padding-bottom: 60px; border-bottom: 10px solid #ffa949; }

.t-border { border-top: 2px solid #dfe2e6; }

/* Layout Styles ------------------ */

.primary-content, .secondary-content { width: 75%; padding-left: 50px; padding-right: 50px; margin: auto; max-width: 960px; }

.wildlife { color: white; text-align: left; padding: 18% 24%; border-top: 10px solid #ffa949; margin: 105px 0 60px; background: #434a52 url('../img/bear.jpg') no-repeat center; background-size: cover; box-shadow: inset 0 0 50px 10px rgba(0,0,0, .8); border-radius: 10px; }

.arrow { width: 50px; }

/* Floated Columns ------------------ */

.resorts, .tips { width: 46.5%; }

.tips { float: left; }

.resorts { float: right; }

/* Float Clearfix ------------------ */

.group:after { content: ""; display: table; clear: both; }