article,aside,figcaption,figure,footer,header,hgroup,main,nav,section,time {display: block;}

html {width: 100%; height: 100%;}
body {height: 100%; margin: 0; background: linear-gradient(0deg, #d0ecf4, #ffffff);}

header { background-color: #d0ecf4; height: 30px; margin-bottom: 50px; border-bottom:1px solid #98d5e8; }
main {padding: 0 10px;}

nav#language {float: right; padding: 0 40px; }
select {height: 30px; }
option[selected] {color:#000000;}

H1 {text-align: center; font-size: 2em; }
H1 .advert {color: #11404e; font-size: 110%; }
.plus {display: inline-block; color:#278faf; transition: transform 1.5s ease;}
H1:hover .plus { transform: rotate(90deg); transition: transform 1s ease; }
.start {text-align: center; font-size: 2em;}

.offer,
.contact,
.message {text-align: center; max-width: 980px;  margin: 0 auto; margin-top: 40px; font-size: 20px;}

.message {font-size: 16px; border: 1px solid #ccc; padding: 10px 0;}
.message.ok {color: green}
.message.error {color: red}

input[type='submit']:hover {background-color: #ddd; cursor:pointer; }
textarea,input { 
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
    font-size: 16px;
    margin: 1px;
    padding: 6px;
    width: 100%;
}


.plus { animation-duration: 2s; animation-name: plus;  width:27px}

@keyframes plus {
  from {
    font-size:10%; color:#cfecf4; width:27px
  }

  to {
    font-size:100%; color:#278faf; width:27px
}

@media only screen and (max-width: 979px) {
    .offer,
    .contact,
    .message {max-width: 100%; margin: 0 20px;}
}