* {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.btn-group {
    width: 100%;
} 

.btn-group button {
    border: 1px solid #fff;
    margin: 0;
    padding: 10px 24px;
    float: left;
    color: #fff;
    background-color: #0081cb;
    cursor: pointer;
    width: 33.30%;
}

.btn-group button:not(:last-child) {
    border-right: none;
}