html {
    font-size: 16px;
    font-weight: 300;
    line-height: 1.5;
    box-sizing: border-box;
}

html, body {
    margin: 0;
    height: 100%;
}

body {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    font-family: "Open Sans", sans-serif;
    color: #373737;
    background: #fff;
    margin: 0;
}

.loading {
    position: absolute;
    width: 100vw;
    height: 100vh;
    background: url(../model/loading.jpg) no-repeat;
    background-size: cover;
    overflow: hidden;
    z-index: 100;
}

.loading:after {
    content: '';
    background-image: url(../model/loading.gif);
    background-repeat: no-repeat;
    background-position: center;
    background-size: 92px;
    position: absolute;
    width: 300px;
    height: 300px;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: end;
    -webkit-align-items: flex-end;
    -ms-flex-align: end;
    align-items: flex-end;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    box-sizing: border-box;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;
}

.button-wrapper {
    position: absolute;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    outline: none;
    bottom: 43px;
    width: 275px;
    height: 72px;
    right: 0;
    left: 0;
    margin: auto;
    background: rgba(255,255,255,0.2);
    border-radius: 18px;
}

.button-wrapper:after {
    z-index: 1;
    content: '';
    display: block;
    position: absolute;
    top: 9px;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    width: 260px;
    height: 44px;
    box-shadow: 0 1px 5px 1px #000;
    background-color: #0b8343;
    border-radius: 8px;
}

#start {
    position: relative;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    outline: none;
    margin: auto;
    margin-top: 8px;
    width: 260px;
    height: 50px;
    background: #00c853;
    cursor: pointer;
    border: 2px solid #32d366;
    border-radius: 8px;
    box-shadow: inset 1px -3px 2px 0px rgba(255,255,255,0.25);
    background-image: -webkit-linear-gradient(top, #4ad868 0%, #42d15f 15%, #1fb748 49%, #13993a 50%, #15973f 100%);
    background-image: linear-gradient(to bottom, #4ad868 0%, #42d15f 15%, #1fb748 49%, #13993a 50%, #15973f 100%);
    font-family: "Open Sans";
    text-shadow: 1px 1px 1px rgba(0,0,0,0.3);
    color: #fff;
    font-size: 20px;
    font-weight: 700;
    line-height: 16px;
    z-index: 2;
}