body {
    color: #333;
    font-family: 'Open Sans', sans-serif;
    margin: 0;
    padding: 0;
}

main {
    margin: 40px;
}

h1 {
    font-size: 30px;
    margin-bottom: 40px;
}

/* Square containers */
.button_container {
    border: 1px solid #ddd;
    margin: 0 10px 10px 0;
    padding: 20px;
    width: 300px;
    height: 300px;
    float: left;
    overflow: hidden;
    box-sizing: border-box;
    text-align: center;
}

/* Spotify */
a#btn_spotify {
    display: inline-block;
    height: 50px;
    box-sizing: border-box;
    border-radius: 25px;
    margin: auto;
    margin-top: 100px;
    padding: 10px 40px 0 40px;
    background-color: #2ebd59;
    border: 2px solid #2ebd59;
    color: #fff;
    font-size: 20px;
    font-family: 'Montserrat', sans-serif;
    font-weight: bold;
    text-decoration: none;
    transition: all .5s;
}

a#btn_spotify:hover {
    background-color: #fff;
    border: 2px solid #000;
    color: #000;
}

/* Amazon */
a#btn_amazon {
    display: block;
    width: 100px;
    height: 100px;
    box-sizing: border-box;
    border-radius: 50px;
    margin: auto;
    margin-top: 75px;
    padding-top: 8px;
    background-color: #232f3e;
    color: #fff;
    text-align: center;
    font-size: 60px;
    transition: all .2s;
}

a#btn_amazon:hover {
    background-color: #fc9a18;
}

/* Twitter */
a#btn_twitter {
    display: inline-block;
    height: 40px;
    box-sizing: border-box;
    border-radius: 4px;
    margin: auto;
    margin-top: 105px;
    padding: 10px 30px 0 30px;
    background-color: #56cdf1;
    color: #fff;
    font-size: 18px;
    font-family: 'Arial', sans-serif;
    font-weight: bold;
    text-decoration: none;
}

a#btn_twitter:hover {
    background: rgb(46,191,236);
    background: -moz-linear-gradient(-45deg, rgba(46,191,236,1) 0%, rgba(40,165,203,1) 100%);
    background: -webkit-linear-gradient(-45deg, rgba(46,191,236,1) 0%, rgba(40,165,203,1) 100%);
    background: linear-gradient(135deg, rgba(46,191,236,1) 0%, rgba(40,165,203,1) 100%);
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#2ebfec', endColorstr='#28a5cb',GradientType=1);
}

/* Indiegogo */
a#btn_indiegogo {
    display: inline-block;
    position: relative;
    margin: auto;
    margin-top: 100px;
    padding: 8px 16px;
    background-color: #fff;
    color: #eb1478;
    font-family: 'Ubuntu', sans-serif;
    font-size: 30px;
    font-weight: bold;
    text-transform: uppercase;
    text-decoration: none;
    letter-spacing: -2px;
    transition: all .2s;
}

a#btn_indiegogo:before {
    content: "";
    display: block;
    width: 0;
    height: 0;
    z-index: 1;
    position: absolute;
    top: 50%;
    left: 50%;
    background-color: #eb1478;
    transition: all .5s;
}

a#btn_indiegogo:hover {
    color: #fff;
}

a#btn_indiegogo:hover:before {
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
}

a#btn_indiegogo span {
    position: relative;
    z-index: 10;
}

/* IDEO */
#IDEO {
    display: inline-block;
    margin: auto;
    margin-top: 100px;
    padding: 16px 28px;
    background-color: #ffffff;
    color: #000000;
    border: 2px solid #000000;
    text-decoration: none;
    font-family: 'Arial', sans-serif;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

#IDEO span {
    position: relative;
    z-index: 2;
}

#IDEO::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background-color: #000000;
    transition: left 0.35s ease;
    z-index: 1;
}

#IDEO:hover {
    color: #ffffff;
}

#IDEO:hover::before {
    left: 0;
}

/* Lyft */
#LYFT {
    display: inline-block;
    margin: auto;
    margin-top: 100px;
    padding: 16px 32px;
    background-color: #ff00bf;
    color: #ffffff;
    border-radius: 999px;
    text-decoration: none;
    font-family: 'Arial', sans-serif;
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 0.2px;
    box-shadow: 0 6px 0 #cc0099;
    transition: all 0.2s ease;
}

#LYFT:hover {
    transform: translateY(4px);
    box-shadow: 0 2px 0 #cc0099;
    background-color: #ff33cc;
}

/* Apple */
#APPLE {
    display: inline-block;
    margin: auto;
    margin-top: 100px;
    padding: 14px 28px;
    background-color: #f5f5f7;
    color: #0066cc;
    border-radius: 999px;
    text-decoration: none;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
    font-size: 20px;
    font-weight: 500;
    border: 1px solid #d2d2d7;
    transition: all 0.3s ease;
}

#APPLE:hover {
    background-color: #0066cc;
    color: #ffffff;
    border-color: #0066cc;
    transform: scale(1.04);
}

/* Nike */
#NIKE {
    display: inline-block;
    margin: auto;
    margin-top: 100px;
    padding: 16px 24px;
    background-color: #111111;
    color: #ffffff;
    text-decoration: none;
    font-family: 'Arial Black', Arial, sans-serif;
    font-size: 22px;
    font-weight: 900;
    letter-spacing: 1.5px;
    border: 2px solid #111111;
    transition: all 0.25s ease;
    position: relative;
    overflow: hidden;
}

#NIKE span {
    position: relative;
    z-index: 2;
}

#NIKE::after {
    content: "";
    position: absolute;
    left: -120%;
    top: 0;
    width: 120%;
    height: 100%;
    background: rgba(255,255,255,0.18);
    transform: skewX(-25deg);
    transition: left 0.4s ease;
}

#NIKE:hover {
    background-color: #ffffff;
    color: #111111;
}

#NIKE:hover::after {
    left: 120%;
}

/* Facebook */
#FACEBOOK {
    display: inline-block;
    width: 86px;
    height: 86px;
    margin: auto;
    margin-top: 86px;
    line-height: 86px;
    background-color: #1877f2;
    color: #ffffff;
    border-radius: 50%;
    text-decoration: none;
    font-family: Arial, sans-serif;
    font-size: 56px;
    font-weight: 700;
    text-align: center;
    box-shadow: 0 8px 18px rgba(24, 119, 242, 0.3);
    transition: all 0.25s ease;
}

#FACEBOOK:hover {
    transform: scale(1.08) rotate(-6deg);
    background-color: #0f66d8;
    box-shadow: 0 12px 24px rgba(24, 119, 242, 0.45);
}