* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

a {
    text-decoration: none;
}

body {
    background-color: #000;
}

.container {
    width: 100%;
    color: #fff;
}

.btn {
    display: inline-block;
    padding: 30px 80px;
    color: #fff;
    background-color: #3784cc;
    border-radius: 30px;
    font-weight: bold;
    font-size: 18px;
    transition: all .5s;
    margin: 20px;
}

.btn:hover {
    transform: scale(1.1);
}

/* icon */
.icon {
    display: inline-block;
    width: 18px;
    height: 18px;
    background: transparent no-repeat 0 0/100% 100%;
}

.icon-windows {
    background-image: url(../img/windows.svg);
}

.icon-android {
    background-image: url(../img/android.svg);
}

.icon-ios {
    background-image: url(../img/ios.svg);
}

.icon-star {
    background-image: url(../img/star.svg);
}