.start-hidden {
  opacity: 0;
   transition: 0.5s
}
* {
  padding: 0px;
   margin: 0px
}
section {
   background: url('../img/bg.jpg') no-repeat center;
   background-size: cover;
   overflow: hidden;
   position: relative;
   font-family: "Montserrat", sans-serif;
   width: 320px;
   height: 480px;
   margin: auto;
   border-radius: 20px;
   box-sizing: border-box;
}
h2 {
    text-align: center;
    color: #fff;
    font-size: 1.5em;
    padding-left: 30px;
    padding-right: 30px;
    position: absolute;
    z-index: 2;
    top: 33px;
    left: 0px;
    width: 100%;
    font-family: "Montserrat", sans-serif;
    font-style: normal;
    box-sizing: border-box;
    font-weight: 800;
}
h3 {
    text-align: center;
    color: #fff;
    font-size: 1.2em;
    padding-left: 30px;
    padding-right: 30px;
    position: absolute;
    z-index: 2;
    bottom: 130px;
    left: 0px;
    width: 100%;
    font-family: "Montserrat", sans-serif;
    font-style: normal;
    box-sizing: border-box;
    font-weight: 800;
    text-shadow: 1px 2px 5px #00000052;
}
.btn {
    display: block;
    position: absolute;
    bottom:20px;
    width: 170px;
    height: 45px;
    line-height: 45px;
    background: #f64e10;
    color: #fff;
    font-size: 18px;
    font-family: "Montserrat", serif;
    font-weight: bold;
    font-style: normal;
    text-align: center;
    left: calc(50% - 90px);
    text-decoration: none;
    border-radius: 10px;
}
.btn:hover {
   background: #bb132d;
}

.countdown {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0px 10px;
    position: absolute;
    z-index: 2;
    bottom: 80px;
    left: 0px;
    width: 100%;
}

.countdown > div {
    font-weight: bold;
    color: #333;
    background: rgba(255,255,255,0.8);
    border-radius: 7px;
    padding: 3px 10px;
    width: fit-content;
    font-size: 1.4em;
    text-align: center;
    line-height: 1;
}

.countdown span {
    font-size: 0.4em;
    display: block;
}