Untitled

<meta name="viewport" content="initial-scale=1.0"/>
<!DOCTYPE html>
<html lang="en">
<head>
</head>
<body>
    <center>
    <img src="https://content.app-valley.vip/icon/1657.png" heigh="175px" width="175px">
    </center>
<! - itms-services: //? action = download-manifest & url = + адрес файла plist->
    <center>
    <p> <button class="custom-btn btn-3">
    <span>Установить</a> </span></button>
    <a href='itms-services://?action=download-manifest&url=https://app.app-valley.vip/plists/1641/install.plist'>
    </center>
</body>
<style>
    .custom-btn {
  width: 130px;
  height: 40px;
  color: #fff;
  border-radius: 5px;
  padding: 10px 25px;
  font-family: 'Lato', sans-serif;
  font-weight: 500;
  background: transparent;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  display: inline-block;
   box-shadow:inset 2px 2px 2px 0px rgba(255,255,255,.5),
   7px 7px 20px 0px rgba(0,0,0,.1),
   4px 4px 5px 0px rgba(0,0,0,.1);
  outline: none;
}
/* 3 */
.btn-3 {
  background: rgb(0,172,238);
background: linear-gradient(0deg, rgba(0,172,238,1) 0%, rgba(2,126,251,1) 100%);
  width: 130px;
  height: 40px;
  line-height: 42px;
  padding: 0;
  border: none;

}
.btn-3 span {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
}
.btn-3:before,
.btn-3:after {
  position: absolute;
  content: "";
  right: 0;
  top: 0;
   background: rgba(2,126,251,1);
  transition: all 0.3s ease;
}
.btn-3:before {
  height: 0%;
  width: 2px;
}
.btn-3:after {
  width: 0%;
  height: 2px;
}
.btn-3:hover{
   background: transparent;
  box-shadow: none;
}
.btn-3:hover:before {
  height: 100%;
}
.btn-3:hover:after {
  width: 100%;
}
.btn-3 span:hover{
   color: rgba(2,126,251,1);
}
.btn-3 span:before,
.btn-3 span:after {
  position: absolute;
  content: "";
  left: 0;
  bottom: 0;
   background: rgba(2,126,251,1);
  transition: all 0.3s ease;
}
.btn-3 span:before {
  width: 2px;
  height: 0%;
}
.btn-3 span:after {
  width: 0%;
  height: 2px;
}
.btn-3 span:hover:before {
  height: 100%;
}
.btn-3 span:hover:after {
  width: 100%;
}

/* 4 */
</style>
</html>