* {
    box-sizing: border-box;
}


.one {
    width: 600px;
    padding: 20px;
    margin: 200px auto;
    background-color: #eee;
    text-align: center;
    font-size: 25px;
    font-weight: bold;
    position: relative;
    border-right: 5px solid #673ab7;
    border-left: 5px solid #f44336;
    font-family: Arial, Helvetica, sans-serif;
}

.one::before {
    content: '';
    position: absolute;
    background-image: linear-gradient(to right, #f44336 20%, #2196f3 20%, #2196f3 40%, #4caf50 40%, #4caf50 60%, #e91e63 60%, #e91e63 80%, #673ab7 80%);
    width: 595px;
    top: 0px;
    right: -1px;
    height: 5px;
}

.one::after {
    content: '';
    position: absolute;
    background-image: linear-gradient(to right, #f44336 20%, #2196f3 20%, #2196f3 40%, #4caf50 40%, #4caf50 60%, #e91e63 60%, #e91e63 80%, #673ab7 80%);
    width: 595px;
    bottom: 0px;
    right: -1px;
    height: 5px;
}

.one::first-letter {
    color: #f44336;
}

.o2,
.o1 {
    color: #f44336;
}