h1 {
    font-size: 30px;
    margin-bottom: 40px;
    display: block;
    margin-block-start: 0.67em;
    margin-block-end: 0.67em;
    margin-inline-start: 0px;
    margin-inline-end: 0px;
    font-weight: bold;
}

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

main {
    margin: 40px;
}

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

.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;
}



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;
}

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;
}

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 {

    /* Permalink - use to edit and share this gradient: https://colorzilla.com/gradient-editor/#2ebfec+0,28a5cb+100 */
    background: rgb(46,191,236); /* Old browsers */
    background: -moz-linear-gradient(-45deg,  rgba(46,191,236,1) 0%, rgba(40,165,203,1) 100%); /* FF3.6-15 */
    background: -webkit-linear-gradient(-45deg,  rgba(46,191,236,1) 0%,rgba(40,165,203,1) 100%); /* Chrome10-25,Safari5.1-6 */
    background: linear-gradient(135deg,  rgba(46,191,236,1) 0%,rgba(40,165,203,1) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#2ebfec', endColorstr='#28a5cb',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */

}

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;
}

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

a#btn_coca-cola:hover {
    background-color:white;
    border: 2px solid #000;
}