Добавил !important, и ничего
<body>
<div class="btn2">
<div class="btn-item-main2">Кнопка</div>
</div>
</body>
<style>
@import url(https://fonts.googleapis.com/css?family=Russo+One:regular);
@import url(https://fonts.googleapis.com/css?family=Montserrat:100,200,300,regular,500,600,700,800,900,100italic,200italic,300italic,italic,500italic,600italic,700italic,800italic,900italic);
@import url(https://fonts.googleapis.com/css?family=Montserrat+Alternates:100,100italic,200,200italic,300,300italic,regular,italic,500,500italic,600,600italic,700,700italic,800,800italic,900,900italic);
.btn2{
transform: skew(-23deg);
user-select: none; cursor: pointer;
font-size: 1.15vw;
border-radius: 0.2vw;
font-family:montserrat Alternates ;
color: rgb(255, 255, 255);
font-weight: 600;
width: 12.5vw;
margin-top: 10vw;
display: flex;
align-items: center;
justify-content: center;
height: 3.3vw;
background: #041B15;
}
.btn-item-main2{
transform: skew(0deg) !important;
}
</style>
Простой
Средний